Azurite
Cu₃(OH)₂(CO₃)₂
Mexico

Azurite
Cu₃(OH)₂(CO₃)₂
Morenci, Arizona

Agate (a variety of quartz)
SiO₂
Lake Superior Shoreline, Michigan

Aragonite with Novacekite
CaCO₃
Placeros de Guadalupe, Mexico

Amethyst (a variety of quartz)
SiO₂

Barite Rose

Barite
BaSO₄
El Solar mine (level 4)
Taxco, Guerrero, Mexico

Beryl (variety Aquamarine)
Be₃Al₂Si₆O₁₈

Biotite Mica
K(Mg,Fe)₃AlSi₃O₁₀(OH)₂

Calcite (optical)
CaCO₃

Calcite
CaCO₃

Calcite
CaCO₃
Pugh Quarry, Ohio

Calcite
CaCO₃
Quincy mine
Houghton, Michigan

Calcite
CaCO₃
Riverside, Calafornia

Celestite
SrSO₄
Clay Center, Ohio

Blue Celestite
SrSO₄
Clay Center, Ohio

Chalk (a variety of limestone)
CaCO₃
Dover, England

Chalcopyrite and Hematite in Calcite
CuFeS₂
Iron Bridge, Ontario, Canada

Corundum
Al₂O₃

Dunite (a variety of Olivine)
(Mg,Fe)₂SiO₄
Quincy mine
Houghton, Michigan

Datolite (variety porcelain)
Ca₂B₂(SiO₄)₂(OH)
Michigan

DogTooth Spar Calcite
CaCO₃
Joplin, Missouri

Enargite
Cu₂AsS₄
Hancock, Michigan

Fluorite Crystals
CaF₂
Lafarge quarry
Niagra Falls, New York

Fluorite
CaF₂
Macomb, New York

Fluorite (variety Blue John)
CaF₂
Derbyshire, England

Feldspar (variety orthoclase)
KAlSi₃O₈

Feldspar (Amazonestone, variety microcline)
KAlSi₃O₈
Colorado

Gypsum
CaSO₄ · 2H₂O
Michigan Natural Storage Co mine
Grand Rapids, Michigan

Galena and Dolomite
PbS
Joplin, Missouri

Graphite
C
Seathwaite mine
Borroudale, Cumbria, England
The Seathwaite mine supplied the first pencil factory in Keswick, England

Graphite
C
Ticonderoga, New York

Geode - Amethyst
South Dakota

Geode
Dale Hollow, TN

Geode
Sheffler mine
Illinois

Hematite
Fe₂O₃

Hedenbergite
CaFeSi₂O₆

Halite
NaCl
Detroit, Michigan

Indian Pipestone (Hematite Sandstone)
Pipestone, MN

Igneous Rocks are formed at high temperatures or from molten materials.

Jasper (a variety of Quartz)
SiO₂
Drummond Island, Michigan

Kernite
Na₂B₄O₇ · 4H₂O

Kona Dolamite
CaMg(CO₃)₂

Lazurite
Na_4-5Al₃Si₃O₁₂S
Afghanistan

Lodestone (Magnetite)
Fe₃O₄

Lepidolite
K₂Li₃Al₄Si₇O₂₁(OH,F)₃
Brasil

Muscovite Mica
KAl₃Si₃O₁₀(OH)₂

Meteorite
Fe
Meteor Crater, AZ

Marcasite
FeS₂

Metamorphic rocks have been altered by heat, pressure, and/or chemical action.

Native Copper
Cu
Quincy mine
Houghton, Michigan

Native Silver on Copper
Ag
Quincy mine
Houghton, Michigan

Olivene
(Mg,Fe)₂SiO₄

Opal
SiO₂ · nH₂O (H₂O up to 10%)
Australia

Orpiment with Realgar
As₂S₃
Getchel mine, Nevada

Obsidian
(35% Quartz, 63% Feldspars, 2% ferromagnesian minerals)
Hawaii
The name Obsidian is due to a printer's error; it comes from Latin, Obsidianus, but really should have been Obsianus, pertaining to Obsius (according to Pliny), the discoverer of a similar mineral in Ethiopa.

Obsidian
(35% Quartz, 63% Feldspars, 2% ferromagnesian minerals)
Oregon
The name Obsidian is due to a printer's error; it comes from Latin, Obsidianus, but really should have been Obsianus, pertaining to Obsius (according to Pliny), the discoverer of a similar mineral in Ethiopa.

Pyrite
FeS₂
Casapulca, Peru

Pyrite in Bornite
FeS₂
Iron Bridge, Ontario, Canada

Pyrite
FeS₂
Arizona

Pyrite
FeS₂
Sparta, IL

Petoskey Stone Fossil (full colony)
Prismatophyllum or Hexagonaria, depending on which book or expert you prefer
Petoskey, Michigan

Pyrolusite
MnO₂
Aouli, Morocco

Pyrolusite
MnO₂
Jackson mine, Michigan

Pentlandite
(Fe,Ni)₂ · nS
Iron Bridge, Ontario, Canada

Quartzite
SiO₂
Yankee Springs, Michigan

Quartz
SiO₂
Brasil

Quartz
SiO₂
Arkansas

Riebeikite
Na₂Fe₃²⁺Fe₂³⁺Si₈O₂₂(OH)₂
Arizona

Rose Quartz
SiO₂

Realgar
AsS
Nevada

Sand Calcite Crystals
South Dakota

Serpentine (var. Chrysotile)
Mg₃Si₂O₅(OH)₄
Ropes Gold Mine
Ishpeming, Michigan

Serpentine
Mg₃Si₂O₅(OH)₄
Lake Valhalla, Montville, NJ

Sulphur
S
Baja California, Mexico

Selenite (a variety of gypsum)
CaSO₄ · 2H₂0
Michigan Natural Storage Co mine
Grand Rapids, Michigan

Sedementary Rocks are formed by the actions of water, wind, and/or organic agents.

Talc
Mg₂Si₄O₁₀(OH)₂
Alaska

Tektite
Indonesia

Tourmaline
Green Na(Al,Fe,Li,Mg)₃B₃Al₃(Al₃Si₆O₂₇)(O,OH,F)₄
White CaMg₃B₃Al₃(Al₃Si₆O₂₇)(O,OH,F)₄
Black NaFe₃B₃Al₃(Al₃Si₆O₂₇)(O,OH,F)₄
Brown NaMg₃B₃Al₃(Al₃Si₆O₂₇)(O,OH,F)₄
Mt. Mica, Maine

Tourmaline
White CaMg₃B₃Al₃(Al₃Si₆O₂₇)(O,OH,F)₄
Black NaFe₃B₃Al₃(Al₃Si₆O₂₇)(O,OH,F)₄

Ulexite
NaCaB₅O₉ · 8H₂O
Death Valley, California

Vesuvanite
Ca₁₀Al₄(Mg,Fe)₂Si₉O₃₄(OH)₄
Mexico

Wavelite
Al₃(OH)₃(PO₄)₂ · 5H₂O
Arkansas

X - The classic unknown variable. Can you help me identify these stones?

Porcupine Mts, Michigan

Houghton, Michigan

Iron Bridge Ontario, Canada

Y - You can collect Rocks and Minerals too. Here are some of the things that will help:
Knapsack
Rock Hammer, chisel, and Safety Glasses
Streak Plate (unglazed ceramic tile)
hardness testing kit
magnifier
Guidebooks
the Internet - search on Rockhound
egg cartons (great for storing rocks-labels in lid)
notepad and pencil
newspaper
black light
a local rock club (information subject to change):
Holland - TULIP CITY GEM & MINERAL CLUB
579 W. 29th St. (49423)
Meeting.: 4th Wedsnesday, 7:00 pm (Sept.-June)
Holland Civic Center

Kalamazoo - KALAMAZOO GEOLOGICAL & SOCIETY
206 E. Vienna St., Schoolcraft, MI 49087
Meetings: lst Wednesday, 7:30 pm (Sept.-June)
KALAMAZOO County Center Bldg.
Fairgrounds, Lake St

Lansing - CENTRAL MI LAPIDARY & MINERAL SOCIETY
1407 Costs Grove, Hastings, MI 49058
Meetings: 3rd Thursday, 7:30 pm
North School, 333 E. Miller Rd.

Muskegon - MUSKEGON ROCK & MINERAL ASSOC.
602 Fleming (49445)
Meetings: 4th Monday, 7:30 pm (Except Dec.)
McGraft Park Community Bldg.

Wyoming - INDIAN MOUNDS ROCK & MINERAL CLUB
4296 Oakview, Hudsonville, MI 49426
Meetings: 3rd Tue., 7:30 pm (except June-Aug. picnics)
Sunset Park Church
3450 Michael Ave.

Zeolites: Heulandite
(Ca,Na,K)₆Al₁₀(Al,Si)Si₂₉O₈₀ · 25H₂O
India

Please forgive any formatting errors - my word processor used to create the label file this page was generated from did not do a very good job of converting to HTML.