Kreigh's Web Resources Collection for Rockhounds

General Information (some commercial, most Non-commercial, and government), Personal Collections, and Rockhound Related Publications

An excellent introduction to common rocks and minerals with some great tidbits of historical background - enough to lift it out of the commercial group where it really belongs: Rockology

These folks want to do their rock collecting on Mars and beyond, and they are worth checking out: The Planetary Society

How to borrow a piece of the Moon from NASA: Do a killer science project
Apollo 11 collected samples of the Moon: Lunar Geology

Michigan's State Gemstone: "Greenstone"
Or find your own state's rock, mineral, or gem: State Gem Search

Some useful information: on mineral and fossil collecting

And lots more useful information: on mineral collecting

The first family run Rock site I found on the Web: Irving Family Web Pages: Rock Collecting

A private collector in Japan with one of the most pleasant Web sites I have visited: Index.htm

Minerals, fossils, and prehistoric tools: My first exchange site, in France

Good intro info (and some advanced stuff too) from Willow Grove School, Willow Grove, IL: Rocks and Minerals

Classroom resources from the USGS: The Learning Web

Great crystal shape drawings by: Ronnie Van Dommelen

Mineralogy Literature: for every US State

How dangerous is my radioactive specimen?: Decay series

A private collector in Italy: Alessandro Genazzani, M.D. PhD.

A private collector in Virginia: Clyde's Collective

Very fine minerals from Japan and elsewhere (and some of the best pictures I've ever seen of minerals): Kato's Collections

Excellent articles and resources on rocks and minerals: The Canadian Rockhound

LEAVERITE NEWS with articles and resources on rocks and minerals by: William S. Cordua

Most of these rocks are probably common near you too: Common rocks of Malaysia

Don't let the title fool you: The Stupid Page of Rocks

Computers, rocks, ufo's, baseball cards, and more : Treasure

What was that unfamiliar term?:
Geological Glossary
Another Geological Glossary
An Illustrated Geological Glossary

How to clean up your collection:
Clean rocks
and clean stones
and some other interesting articles for rockhounds

Good introductory information on rocks and minerals: Common Minerals and their uses

Private collector: Zeolites

If any of you want recipes for crystal growing:
Grow your own crystals then click on MENU; then select: Creating Crystals (Crystal making tips and recipes)
How to Grow Crystals
Kids Camp

Great info on minerals: The Mineralogical Record

A private collector: Mapping, Rock Collecting, and some interesting links

A Frenchman in Korea: Beautiful Crystals

Interesting pages from a private collector: Ron Winter

For those really tough science questions, you can ask an expert (but do your homework first): The Mad Scientist Network

An excellent site to get started on Rockhounding: Your About.com Guide to Mineral Collecting

A trio of collections of links where you can generally find the answer to anything related to geology and mineralogy if you surf enough of their links (warning, you can get lost visiting these sites):
Aaron Wisher's Webpage
Geologia na Web
More Geoscience Links

The History of Geology and the Geosciences: GeoClio

A few suggestions from me: on Labeling and Cataloging

Lapidary and Jewelry Making

If you are intersted in cutting and polishing rocks, this is a great place to start: The Lapidary Digest

A great source on how to cut and polish rocks and minerals: The Lapidary Journal

Something to do with your rocks: Jewelry making supplies

Make something with your flint or obsidian by hand: Knappers Anonymous

Make your own large scale rock saw: Diamond Wire

Gemworld has an interesting site beyond this reference to one form of polishing rocks: Tumbling Rocks and Minerals

Many beautiful items and another way to polish rocks: Spheres

Carol Bova's ezine: Eclectic Lapidary

Turn your rocks into jewelry: Colorado Academy of Silversmithing and Art Metal

Get serious about learing to cut rocks: William Holland School of Lapidary Arts

Metalsmithing: ArtMetal Project

Fred Ward: Gem Book Publishers

Lapidary Help and Tips from tradeshop.com

Lapidary Help and Tips from gemzone.com
Jewelry Courses
Silversmithing

Faceting Help and Tips
More Faceting Help and Tips
Twenty-four Carat Network - Paul Ahlstedt

Cubic Zirconia and Gem Processing Machines: Anand Engineering Works

Cutting Spheres: Thunder Eggs, and More!

The World's largest collection of Lapidary and Jewelry making Videos: AlMar Videos

Tips on cutting opal, spheres, and more: My personal Home Page and some Information on my homemade lapidary equipment

Geology, Mineral Classification, Databases, Satellite info, and Software

Use a 'tricorder' to identify rocks, just like the Mars Pathfinder did: Alpha, Proton, X-ray Spectrometer

Everything you ever wanted to know about volcano's plus lots of neat pictures: Volcano World

Did you ever want to study earthquakes?: Build your own Seismograph
Where you can learn more or report a quake you recorded: USGS National Earthquake Information Center

A great collection of links on Geology at Netscape: Geology directory

A really great summary: Everything you wanted to know about the business of Geology and Mining

Go spelunking: The Virtual Cave

Serious satellite data for those who want to do serious prospecting: Land Biosphere Links

Let Aerial Images, Inc. show you the next spot you plan on collecting: TerraServer

Buy satellite pictures from Uncle Sam: EROS Data Center

Map search: USGS

A truely great mineral database: Minerals A - Z

The cause of rose quartz color:
Dr. George R. Rossman
Julia Goreva

A global database of minerals and where to collect them: MinMax

If you want to learn about agates, this is where to start: Roger Pabian on agates

MAS/MILS CDROM: Database of Prospect Claims or Download Demo

Label your collection: MMD LABELING PRODUCTS

Minerals on CD-ROM: The Photo-Atlas of Minerals

Another software source: Mineralogy Software

J. Adam's Mineral Page: with lots of useful information and links

jewelry design software: ProtoCAD
Basic CAD

Where am I right now?
GPS Systems
GPS Links
GPSwsgroup sci.geo.satellite-nav
Resources for GPS owners and mapmakers: Freeware

A French Rockhound magazine: Le Regne Mineral

Goldschmidt's Atlas der Krystallformen: A classic work about crystals on CD ROM

Topographic maps on CD and links to downloadable maps: USGS Mapping Publications

Free topographic maps: TopoZone - The Web's Topographic Map

The Probert Encyclopedia: Scroll down for Rocks & Minerals

Digital RockHound's Companion: and other database software

Mineral Photography and Micromount viewing (related by Optics)

Tips on how to get good pictures of Rocks and Minerals:
Taking photos of reflective objects
Taking photos of fluorescent minerals
Taking digital photos for websites

Micromounts and more from France: Association Fran*aise de Micromin*ralogie

Mineral Photomicrograph Site: Scott Whittemore

More micromounts: The Norwegian Rock & Mineral Guide
Athena Mineralogy
The Eudialyte page

Small rocks from outer space: Collecting Micrometeorites

More small rocks: Micromounting

A nice Webzine on minerals: French and English Versions Available

A place to trade specimens: International Micromount and Thumbnail Exchange

Fine Minerals, Crystal-Growing and Educational Outreach Services: Myrddin Emrys Limited

Rock Clubs, Collecting Locations, and Individual Mineral Type displays (some may be commercial)

A collectors assocation for one mineral: Calcite

Visit a great rock shop and meet the author of: Rockhounding in Eastern New York and Nearby New England

Collecting locations from a rockhound: Oregon and Washington locations

I finally have a club near me that is online: The Kalamazoo Geological & Mineral Society

Find a rock club near you (and more):
American Federation of Mineralogical Socities
Rocky Mountain Federation of Mineralogical Societies
South Central Federation of Mineralogical Societies
Midwest Federation of Mineralogical Societies
The Mt. Hood Rock Club
The Swedish Federation of Amateur Geologists (English) SARF (Swedish)
Click on the Clubs in USA button
Rock & Mineral Associations of Canada
Canadian Clubs
The Lapidary Rock & Mineral Society of B.C.
Antwerp Mineral Society
Florida Society of Goldsmiths
Gem Newsletter Editors
GEODE (Netherlands)
Geological Society of America
International Colored Gemstone Association
Society of American Silversmiths (SAS)

Fuka is in Okayama Prefecture, Japan. Fuka is known for its abundant skarn minerals: Fuka

Would you believe 'a diamond in the rough'? The Graphite Page

The name says it all: www.wulfenite.com

From the collection of William Tompkins (and some trip reports too): Zeolites, Calcite, and Quartz

If you are in the Bakersfield, CA area: The Kern County Mineral Society

Blarney Stone may not be collected: Irish Geological Association

If you are in the Roswell, NM area: The Chaparral Rockhounds

Glowing Rocks:
Fluorescent Mineral Society, Inc.
Black lights and more from UV SYSTEMS
DesertUSA

Pacific Fishery Biologists Ore-ROCK-On Rockhounding Web Site: Oregon Rockhounds OnLine

Someday I'll get to go collecting here: Collect your own diamond specimen

Diamonds from these sites (and others) are sometimes found in Michigan's glacier deposited gravels:
Diamonds from www.dentonia.com
Diamonds from www.noront-resources.com
Diamonds from kettleriver.com
Diamonds from www.infonorth.org
Diamonds from www.mining-technology.com

Every state should have a site like this: Rockhounding in Arkansas

Rocks from down under: The Australian Mineral Collector

A great collection of rocks from Belgium and around the world: The Rik Dillen Mineral Collection

The traveling rocks at Racetrack Playa, Death Valley, CA: Moving Rocks

Boo's Rockhound Geology Homepage: Field Trips

My own reports from the Grand Rapids, Michigan area: Field Trip Reports

Rockhounding in British Columbia: Let John Ratcliff give you a tour

The North Jeffco Gem & Mineral Club: Denver, CO USA

An Rockhounds event calendar, auction, and more: Treasure Net

Collecting in a river or lake: fresh water pearls

Some great resources from the mid-west: Friends of Mineralogy

Collect zeolites and more, but watch out for high tide: Bay of Fundy

A great collection of links from Brad Smith: Culver City R&M Club

Dixie Reale has fun stuff for kids too: Jasper, Agate, and more

Collecting at Mount Saint Hilare and more: Montreal Gem and Mineral Club

Steve Reutlinger: Virtual Field Trip Page

Sandra Downs: Cyberwall Collecting Sites

Check out Topaz Mountain: the Collectors Guide

Learn about earth sciences and rockhounding: Delaware Mineralogical Society, Inc.

Gold Panning in York County, PA: Earl Hartman's Outdoor Pages Gold sites & news groups:
Gold Prospectors
Gold Prospectors Association of America
Gold Prospecting and Panning, Maps, and more

Claimed to be the largest Mining Event in USA: Bohemia Mining Days

Pretty quartz pebbles: Cape May 'Diamonds'

Chaparral Rockhounds: in New Mexico

A list of Mine locations in every state (and more): from vughunter.com

Discussion Lists and Link Lists
Some of these lists are moderated and you must send an Email and ask to join. Others I do not have good contact info, only an Email address that will product a bounce with instructions to join. And some send you to a website where you can join. Join a virtual club!

This is where I found the Rockhounds mailing list I joined and it has had lots of great references. Unfortunately, It died on June 15, 1999, but still had archives up the last time I looked: Rockhounds Home Page
One of my replacements for the Rockhounds List that died: Rockhound List
One of my replacements for the Rockhounds List that died: New Rockhounds List
One of my replacements for the Rockhounds List that died also has died, Sharon Shea's Rocks-and-Fossils List -- it was replaced by three lists:

rocksandfossils@egroups.com
fossil-collectors@topica.com
Rockhounds@Drizzle.com

A great collection of information and links from Europe: Mineralogy Club of Antwerp, Belgium

Looking for someone who is crazy about the same mineral you are?: MINERAL FANATICS INDEX

Link to lots of links: Yahoo Geology Links

A discussion list for: ULF/ELF phenomenon

Fossils

Fossils by State and much more: Your first stop for fossil homework

Michigan has outcrops of some of the oldest rocks on earth: The Oldest Antiques on Earth

Minerals, fossils, and prehistoric tools: My first exchange site, in France

Some useful information: mineral and fossil collecting

Its safer to hunt fossil sharks: Long Dead Sharks

Not for bathtub use: Fossil Sponges

Collecting Fossils in California: Specific sites and much more

Located in Cleveland, Ohio: North Coast Fossil Club

A wide selection of better than average fossils: Two Guys Fossils

Fine Mineral Specimens and Fossils: Trafford | Flynn

Dinsoaur Eggs and other fine fossils: PaleoPlace

Petersburg Paleontological Laboratory: Russian fossils

Paleontology links: Fossils

A Triceratops and other great fossils: Fossilnet, Inc.

Specimens, Trip Reports, and more: Scullys Crystals, Minerals, and Fossils

Take a chartered field trip: Fossil Expeditions

October is: International Dinosaur Month

Department Of Paleobiology National Museum of Natural History: Digital Shark Tooth Key

Jim Bourdon on Lee Creek: Guitarfishes, Skates, and Rays

Where did all the dinosaurs go? The K-T Boundary

Fossils and related information focusing on: west-central Illinois

Jeff's Journal: Dinosaur Paleontology

Fossils, Minerals, and a fun web page: Ewok's Home Page
and fossils just from the Geelong region

A rockhound ring: Gems, Minerals, & Fossils Clubs WebRing

Paleoart & Minerals: Mineral Fossil Lapidary Network

More links about fossils:
Plant fossils
Ammonites
Fossils
Fossils II
The Fossil Company

Trapped bugs and petrified tree sap:
Amber
Amber Page
Real Amber

Paleontology links: Fossils

A good variety of fossils: The Gateway Country Fossil Page

Claimed to be 1/4 mile east of the exact middle of nowhere: The John Day fossil beds

Carboniferous Ferns:
Mazon Creek ferns
More ferns
Penn. ferns

A baby T-Rex: Tinker

Mostly from the Atlantic Coastal Plain: Vertebrate fossils

From Nebraska: Invertebrate fossils

Mass Extinctions: Can you name the five big ones before you click?

Paleomicrophotographs: from Rik Hill

Some fossils: from Steven Holley

Inclusions in Baltic Amber: from Andrzej Gorski

Petoskey Stones and Petoskey Stone jewelry from: Steve Webster

Trilobites from: Kevin Maddy

Commercial sites (and most have great pictures)

A nearly complete directory of places to buy rocks and minerals: Rock Shops

Educational and club resources, coloring books, cartoons, and more for Rockhounds: Diamond Dan Publicatiions

Visit a great rock shop and meet the author of: Rockhounding in Eastern New York and Nearby New England

A great Rockhounds site with lots of links (run by a miner in Maine): Tourmaline, Great Collecting sites, and more

One of the best all-around Rock and Mineral sites on the Web: Bob's Rock Shop

A dealer with really nice specimens I have dealt with successfully: John Betts - Fine Minerals

Someone else I have dealt with successfully, and he sure makes fine display cabnets: Monadnock Mineral & Display

Analytical services, meteorites, mine models, minerals, books, and more: Excalibur Minerals

Great Opal Rough: Opal Rough from Keith Rigby and some hints on cutting small stones by me that Keith has been kind enough to post.
And another good source: Opal Rough from Art Kingsbury

You can find out how crystals are mined and cleaned too: Sweet Surrender Crystal Mine

Extensive lapidary site: Art From God

A wide selection of fossils from around the world: Jack McCullough Fossils

Fine quality mineral specimens from worldwide localities: from Marin Mineral

Rough and Gems: Russo &.

Located in Bingham, NM: The Blanchard Rock Shop

Some really beautiful quartz: Cascade Scepters

Interesting Dealer: Mineral specimen dealers.Gwynant Valley Minerals.U.K. .

Lapidary equipment, tools and supplies: Dads is one of the oldest and largest rock shops in the USA

A dealer that is out of this world: Meteorites, Impactites and Tektites for Science, Education and Collectors - english

Cut stones and faceting rough: Heirloom Creations

http://www.greatsouth.net

An extensive collection of spectacular specimens: Great South Gems and Minerals

Tools: Miners, Inc.

Supplies and more for educators and rockhounds: WARD's Natural Science Establishment

Rare and out-of-print Geoscience books: Ed Rogers

A greek dealer in minerals and educational earth science resources: Dimitris Minatidis

Photos, Minerals, and digital postcards: Earth Moods

A great source for MicroMount Equipment, Supplies, and Specimens: Mineralien and some great pictures

A newsletter about gemstones and the market: The Gemstone Forecaster

Manufacturer of a Silicon Carbide that mimics Diamonds: Moissanite

Another interesting dealer: The Meteorite Exchange

Arizona and the Southwest USA: Gallagher Minerals

Nice stuff with a great 'Hall of Fame': The Mineral Gallery and Auction

Minerals from Tasmania and Australia and more: the Main Adit

Dealer: Apache Gems

A dealer with specimens from all over the world: Penn Minerals

This site had some interesting opal and many great crystals: Adams Minerals

Besides books or flowers, you can collect minerals by mail too: Monthly Fix

An interesting dealer with a lot more than just rocks: Aaron Andersen

Peruvian minerals, including blue opal: Mining Center

Thumbnails and more: Mineral Zone

A dealer with great information content too: The Gem and Mineral Exploration Company

Real marbles made from rocks and more: Round Rocks Etc.

Ann and Andy Parker: Agate House Lapidary

A whole lot more than just purple rocks: The Amethyst Galleries

Gold mining supplies:
Cal-Gold
Lifestyle Store
Awesome Alloy Mining Supply

Trinity Mineral Co. Auction Room
The GemNet Auction

Beautiful specimens from the USA and elsewhere: Kevin Conroy Minerals

Unlabeled/Uncategorized Sites I've collected (now admit it, you've still got a bunch of unlabeled stones from that real productive trip last...gee, it couldn't have been that long ago...anyway, I'll get them done real soon now, but you can still enjoy the finds).

If you need to find a classic reference source try: Out of Print Books

Sculptures, carvings, fossils, candles, crystals, rough material, shona art, mining equipment: and More

An interesting mix of minerals and literature: Tidbits

You can find free classified for your web site, your mineral business, exchanges on my page : You'll find also many info about minerals from Brittany

For the Lapis website, surf to: Lapis Extra

Here is a link to Emerald Creek in Idaho: Star Garnets

Diamond mining in Canada: and go back to the table of contents for Sue, the T-rex

Some interesting links: rocks in hemsida

More interesting links: The Cape-Atlantic Rockhounds Links Page

Still more interesting links: Adirondack Rockhounders Hot Links

Hollow rocks with crystals: Geodes

Want to trade something?: Rock Swap

Minerals from Arizona: Blue and Green (and other) Rocks

Minerals from the Elemwood, Gordonsville, and Cumberland mines: Tennessee Minerals

A good rock magazine: Rocks and Minerals

Another dealer: UC Minerals

Nice crystals from a dealer: The Mineral Vug

GemData, Mine Design & The Spectrum Network: Home of the original interactive "Gem, Mineral & Jewelry Show Calendar"

Tourmaline and more: Trinity Minerals

More mineral pictures and other neat stuff from a collector in Norway: Bjorn's Mineral Web

A rockhound ring: Gems, Minerals, & Fossils Clubs WebRing

A dealer in flats (and individual specimens): OsoSoft Mineral Connection

A Canadian dealer: Gemstones from all around the world

One of the best known collecting sites in the world: Mont Saint-Hilaire, Quebec, Canada

Rough gemstones from around the world: LICCINI

The Crystal Fair: rock & mineral, gem & jewelry shows

Take the trip of your dreams and collect minerals in Mexico: Mineral Safari

Made in Montana: Mac's Gems

PA geology: A FUTURE GEOLOGIST'S WEB PAGE

PA minerals and lots of information: Penn Minerals .

Go collecting with Bob Jackson (and he sure has some nice rocks): Geology Adventures

Another dealer: P.A.Z. Gem and Crystal Creations

This site is run by a jasper miner: The American Cutters Gallery

Montana Agate Slabs and rough: Harmon's

Lapis, Jade, Emeralds, and other rough: Beauty and the Beads

Wholesale Jewelers' and Lapidary Supplies: Thunderbird Supply Company

Geodes, minerals, and fossils: Geode Home Page

A dealer with a good selection of books too: The Mineralogical Research Co.

Italian and worldwide minerals: Alessandro Genazzani

Geologist, Journalist, wannabe Web Designer: Aaron Fox

From the Schorl King: SJR ~ ASSORTED SPECIMENS 1

Interesting dealer with unique specimens: Royal Scepter Gems and Minerals

Publisher of gem & mineral references and guides: LR Ream Publishing

Crystals, shells, coral, and more: Shamrock Crystals

Tidbits on Opal from a jeweler: Joseph Rosi

Custom cut gemstones: Faceters Co-Op

A lobbying organization for rockhounds: American Land Access Association

Rockhounds Mailing List Info FAQ File
Jon Gladwell Collection
WORLD WIDE MINERAL LINK COLLECTION
Rays Rock Page
Rio Grande Tool Company
Worldwide Imports - Division of Imex International
Minerals - Mark Case
The Stone Company
Aqualit Top Stone
CJ Lanese rough and faceted
Coast-to-Coast Rare Stones
Cranestone Gems - Australia

The BLM wants to rewrite the mining act of 1872 that lets US citizens be Rockhounds (and governs mining activities in general): Surface management regulation #3809

Web Site design services for Rockhounds, great links, and much more: Bradford Smith

More 'uncategorized' links, but I've started labeling and sorting them.

COURSES & TUTORIALS

Univ of Wisconsin Geology Course

Lapidary Help and Tips from geology.wisc.edu

GEMSTONES & GEMOLOGY

The Gem and Jewelry Master Board BBS
http://www.ganoksin.com/borisat/nenam/polaris.htm Making Your Own Polariscope for Gemology
GemNet Forum
Visual Commodity Index
Facet Shoppe
GBA-Worldwide rough and faceted
Gemstone Brokerage Associates Ltd
Gemstone Gallery
http://www.greatbasin.net/~higrade/index.htm High Grade District

GOVERNMENT INFO SOURCES

U.S. Geological Survey
Geological Survey of Canada

JEWELRY

Ganoksin Online
Small Bench Tools Descriptions
Tips From The Jewelry Bench Search Engine
Jewelry Courses
Jewelery Design Resource Site
The Jewelery Arcade

MINERAL PROPERTIES

Common Minerals and Their Uses
Overview of Gemstone Production - US Bureau of Mines
Geographic Nameserver
Minerals, Crystals and Their Systems
Mineral Names
Periodic Table of Elements
Geo-Search - Jeremy Fuller
Piezoelectric properties of quartz - Louis Bradshaw
Los Angeles Natural History Museum CDROM of Minerals
Mineral Chemistry
        and type localities
Mineral Clip Art
Mineral Information & Pictures
Radioactive Minerals - Andy Christy
Mineral Specifications Online

ROCK & GEM CLUBS - General

Canadian Clubs
California Clubs

ROCK & GEM SHOWS - General

Rockhounds Show Calendar

ROCK & GEM SHOWS - Named

Quartzsite, AZ Show
Trona, CA Show - Jon Gladwell
Canadian Gemmological Assoc. Show

A good place to be in September: The Denver Gem & Mineral Show

SAFETY

Michael McCann's Arts Safety and Hazards
UNMC Chemical Safety MSDS Home Page
EPA's index to MSDS Safety Data Sheets
Valley Fever
What is Valley Fever
More Valley Fever

SPECIMENS - by Area or Locale

Arizona Rainbow Petrified Wood - Charles Stewart
Louisiana Fossils
New York Area Fossils
North Carolina Fee-for-entry sites
North Carolina Archaelogy and fossil links
Oregon Rockhounding
Tennessee Locality Page - Brett Shaffer
Virgin Valley Opal
Wisconsin Geology/Mineralogy - William Cordua

SPECIMENS - by Country

The Australian Mineral Collector
Belgian Virtual Quarry
The Norwegian Rock & Mineral Guide
Portugese Sauropod Trackways
Russian Minerals
Binn Valley Switzerland - Bart de Weerd

SPECIMENS - by Named Material

Fluorite
Historic Gold Collection
Chrysocolla and Gem Silica
Fluorescent Minerals
Larimar
Gold prospecting
The Agate Page - Roger Pabian
Rock Eggs
Benitoite
Kentucky Geodes
Diamonds
Japanese law scepter quartz twin
Jasper
Optical grade calcite
Sui-Seki Pictures
Tourmaline
Wulfenite (Smithsonian)

SPECIMENS - by Named Site or Mine

Wise Mine Page
Jacobs Ruby Mine
Himalaya Mine - California Tourmaline
Topaz Mountain
Herkimer Diamonds
Kelly Mine Smithsonite or Kelly Mine
Crystal Hill Mine

Thunder Eggs and the Baker Mine

You can return to The Tomaszewski Family Public Home Page, or visit my personal homepage for more Rockhounding information, or read about Labeling and Cataloging Rocks, Minerals, and Fossils, or learn how to make your own lapidary equipment, or review some field trip reports, or view some specimens from my collection, or send me Email at Kreigh@Tomaszewski.net .