mineralogy of southwest montana - montana tech - montana's ... · wyoming archean province -...
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Mineralogy of Southwest Montana By Michael J. Gobla
Covellite MBMG Museum Butte
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Presentation Outline• Montana Geologic Provinces• World Class Mineral Localities• Collecting in the Pioneer Mountains
Gold, HighlandsMBMG Museum Butte
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Gemstones• Two official State Gemstones• Montana Agate• Sapphire
CorundumRock Creek Montana Agate
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The Great Plains – Sedimentary RocksCalcite, Barite, Gypsum, Montmorillonite, Quartz
BariteCedar Creek
Montana Agate Yellowstone River
Calcite Carter County
Pertified Wood HouseBillings
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The Alkalic Province -Sediments Penetrated by Alkaline Intrusive Rocks
• Aegirine, Augite, Biotite, Burbankite, Davanite, Eudialyte, Gold, Hauyne, Barytolamprophyllite, Nepheline, Olivine, Orthoclase, Phologopite, Sanadine, Wadeite Eudialyte
Bearpaw Mts.
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The Absorka Province - Precambrian Metamorphics, Intrusive, and Volcanic Rocks
Calcite, Chromite, Enstatite, Gold, Opal-Hyalite, Petrified WoodPlatinum minerals
CalciteRed Cliff
Gallatin River
Quartz replacing wood
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Wyoming Archean Province - Precambrian Metamorphic and Tertiary Intrusive Rocks
• Metamorphic Rocks –Almandine, Anthophyllite,Corundum, Kyanite, Talc
• Tertiary Intrusives – Gold• Pegmatites – Biotite,
Schorl, Microcline, Muscovite, Rose Quartz
Dendritic TalcYellowstone Mine
CorundumElk Creek Mine
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The Rocky Mountains – Many Rock Types• Pegmatites – Quartz,
Schorl, Microcline, Albite, Titanite, Epidote, Allanite
• Skarns – Epidote, Magnetite, Scheelite, Grossular, Spinel
• Tertiary Intrusives – Gold, Silver, Chalcocite, Galena, Hemimorphite, Pyrite, Rhodochrosite, Wulfenite
QuartzHomestake Pass
DiopsideBald Mountain Skarn
WulfeniteRadersberg
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The Belt Basin –Metasediments and Intrusive Rocks
• Bornite, Boulangerite, Chalcopyrite, Galena, Goethite, Gold, Pyrite, Silver, Vermiculite
PyriteTroy Mine
BoulangeriteIron Mountain Mine
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World Class Localities• Butte Ore Deposit - 146 species – 2 new minerals• Black Pine Mine – 72 species – 3 new minerals• Stillwater Complex – 68 species – 5 new minerals• Boulder Batholith Pegmatites – 34 species• Also Elkhorn Mine, Radersberg District, Philipsburg District
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Butte – The Richest Hill on EarthAnaconda Mine
Berkeley Pit
Parrot Mine
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Butte - Alice Mine
Gold MBMR Museum Butte Silver
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Leonard Mine - Butte
Enargite
Covellite
Chalcocite
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Boston and Montana Company
Digenite
Barite
Leonard Lewishon
Bornite after Digenite
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Luzonite on Covellite
Leonard Mine, Butte
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Hinsdalite on Enargite
Leonard Mine, Butte
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Emma Mine - Butte
Rhodochrosite
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Bornite Steward Mine
FluorapatiteButte
BariteButte
Calcite Butte
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Boulder Batholith Pegmatites
Smoky QuartzRheanna Star
MBMG Museum Butte
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Philipsburg District
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Black Pine Mine – Granite County
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Vesleyite
Mimetite Kipushite
Tetrahedrite
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Japan-law twin QuartzBlack Pine Mine
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Olivenite – Black Pine Mine
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Rhodochrosite on QuartzBlack Pine Mine
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Hubnerite and Rhodochrosite on QuartzBlack Pine Mine
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Radersburg District
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Rosasite, Summit Mine
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Mimetite, Summit Mine
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Descloizite, Summit Mine
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Vanadanite, Jo Jo Mine
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Wulfenite, James R. Lee Mine
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Wulfenite on Vanadanite, Blackhawk Mine
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Pioneer Mountains
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Crystal Park
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Crystal Park Amethyst
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Quartz Crystals - Crystal Park
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Gar Mine – Comet Mountain
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Wulfenite, Gar Mine
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Pioneer Mountains
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Calvert Mine – Epidote
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Calvert Mine
Epidote MBMG Museum Butte
Grossular
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Ivenhoe Mine – Browns Lake
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Hecla Mine – Lion Mountain
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Hecla Mine – Lion Mountain
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Azurite Malachite – Lion Mountain
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Smithsonite – Hecla Mine
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Hemimorphite – Hecla Mine
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Indian Queen Mine – Farlin
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Azurite – Indian Queen Mine
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Iron Mountain Mine, Argenta
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Hemimorphite Rosasite, Argenta
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Ingersoll Mine
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Ingersoll Mine - Chlorargyite
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Ingersoll Mine
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GPS
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Stacking Technology Mountain
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Fluorite – Warm Springs Mine
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Montana!