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minerals of wyoming

Wyoming Minerals (Not a complete list)

 

Rock Forming Minerals


Quartz 

Crystalline Varieties

   ** Milky quartz (Miners called it bull quartz)

   ** Amethyst

   ** Rose quartz

   ** Citrine

   ** Rock Quartz (clear, transparent, colorless)

   ** Ferruginous Quartz

Cryptocrystalline Varieties

   **Chalcedony

   **Agate

   **Jasper 

*Feldspar Group

  *K-spar Sub-Group

Microcline

   ** Amazonite

      Orthoclase

      ** Adularia

      Sanidine

Plagioclase (a solution series)

      Albite

      Anorthite

      Andesine 

      Labradorite

*Amphibole Group

   Actinolite-Tremolite 

   **Cryptocrystalline Variety found in the rock nephrite (Wyoming Jade)

   Horneblende

   Grunerite

   Crocidolite (Rebeckite)

*Serpentine Group

   Chrysotile

   Lizardite

   Antigorite

*Pyroxene Group

    Augite

    Diopside

Spodumene

 Enstatite

*Mica Group

   Biotite

   Fuchsite 

   Lepidolite

   Muscovite

   Phlogopite

Olivine

*Garnet Group

   Almandine

   Pyrope-almandine 

   Pyrope

   Spessartine

Calcite

Dolomite

Gypsum

** selenite (clear crystals) 

** satin spar 

** alabaster


Other Wyoming Minerals


Common to Very Rare


Allanite

Ankerite

Anhydrite

*Apatite Group

   Flourapatite

   Hydroxylapatite (Dahllite**)

Aragonite

Andalusite

Arsenopyrite 

Azurite

Autunite

Barite

Benjaminite^

Bertierite^

Beryl

** Emerald^

** Helidor^

**Aquamarine^

Bornite

Bournonite (Cog wheel ore)

Carnotite

Coffinite

Chalcocite

Chalcopyrite

Chromite

Chrysocolla

Clinochore 

**Kammererite (A variety of Clinoclore)

Clinoptilolite

Columbite-Tantalite

Cordierite (**Iolite)

Corundum

** sapphire^

** ruby^

Native Copper^

Covellite

Cuprite

Diamond^

Epidote

Euxenite^

Fluorite

Galena

Native Gold

Grandidierite^

Graphite

Hematite

   **Specularite— one of the varieties found in WY

Hemimorphite

Ilmenite

Ilsemannite^

Kyanite

Leucite^

“Limonite”

Manganese oxides

Manganite^ 

Magnetite

Marcasite

Mascagnite^^

Minyulite^

Monazite

Molybdenite

Orpiment

Phenakite^

Native Platinum^

Realgar (Lorandite)

Pectolite

Psilomelane

Pyrite

Pyrrhotite

Scheelite

Schroeckingerite (Dakeite)^

*Serpentine Group

   Chrysotile

   Lizardite

   Antigorite

Sheridanite^^

Siderite

Sillimanite

Native Silver^

Smithsonite^

Sperrylite^

Sphalerite

Starolite

Stromeyerite

Native Sulfur

Talc

Tenorite

Tetrahedrite

*Tourmaline Group

   Elbaite

   Schorl 

Trona (Other minerals related to Trona include Eitelite^, Thermonatrite^, Shortite^)

Tschermigite^^

Uraninite

Variscite^

Vermiculite

Vivianite^

Wulfenite

*Zeolite Group

   Anaclime

   Clinoptilolite

   Natrolite

   Stilbite 

   Thompsonite^

Zoisite

** pink microcrystalline variety called Thulite

Note: Opal is amorphous and not considered a mineral. Amber, coal, asphaltum; gilsonite, ozokerite are organic compounds and not minerals. Bentonite is a mixture of clay minerals and considered a rock not a mineral.


Definitions:


*Mineral groups are 2 or more mineral species having identical or closely related structures. If the specific mineral species is not known or unable to be determined with available tools, they may be referred to with the group name (ie: an amphibole). 

** A mineral variety  is a variation in distinctive physical properties of a specific mineral species such as color, minor impurities, or habit. The different varieties of a given mineral species have the same base chemical composition. 

^ Rare to extremely rare In Wyoming 

^^ So rare, almost didn’t make list


References:

Root, F.K., 1977, Minerals and rocks of Wyoming: Geological Survey of Wyoming [Wyoming State Geological Survey] Bulletin 56, 84 p. (Revised from 1972.)


Hausel, W.D., 1986, Minerals and rocks of Wyoming: Geological Survey of Wyoming [Wyoming State Geological Survey] Bulletin 66, 117 p., 30 pls.


Hausel, W.D., Root, F.K., Jones, R.W., and Albert, K.G., 1988, Guide to some rocks and minerals of Wyoming: Geological Survey of Wyoming [Wyoming State Geological Survey] Miscellaneous Publication, 30 p.


Hausel, W.D., 2005, Minerals and rocks of Wyoming—A guide for collectors, prospectors, and rock hounds: Wyoming State Geological Survey Bulletin 72, 159 p.


Hausel, W.D., and Sutherland, W.M., 2000, Gemstones and other unique minerals and rocks of Wyoming—A field guide for collectors: Wyoming State Geological Survey Bulletin 71, 268 p. (Reprinted 2014.)


Nelson, Willis H., Prostka, Harold J., Williams, Frank E., Elliott, James E., Peterson, Donald L., 1980, Geology and mineral resources of the North Absaroka Wilderness and vicinity, Park County, Wyoming, USGS Bulletin 1447, U.S. Geological Survey, 101 p.


mindat.org various pages referencing Wyoming mineral occurrences, Accessed 10/2023 and 2/2022.


Gregory L. Jones personal collection and knowledge

BigHorn Basin Rock Show

Park County Fairgrounds, Powell, Wyoming

Copyright © 2025 BigHorn Basin Rock Show - All Rights Reserved.

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