Calaverite-fluorite vein (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Cripple Creek Mining District, Colorado USA) 1

            Calaverite-fluorite vein from the Oligocene of Colorado, USA. (field of view ~2.1 centimeters across)

Gold-colored mineral = calaverite (AuTe2)
Purplish areas = fluorite (CaF2)

The Cripple Creek Gold District of central Colorado, USA is famous for its unusual gold and silver mineralization.  Precious metal mineralization occurs in the Cripple Creek Diatreme, the root zone of a deeply eroded volcano dating to the Early Oligocene (32 Ma).  The dominant lithology at Cripple Creek is phonolite, a scarce, alkaline, intermediate, extrusive igneous rock.  Cripple Creek gold can be found in its native state (Au), but it typically occurs in the form of gold telluride minerals: for example, sylvanite - (Au,Ag)2Te4, calaverite - AuTe2, petzite - Ag3AuTe2, krennerite - (Au,Ag)Te2, and nagyagite - Pb5Au(Sb,Bi)Te2S6).  Silver also occurs in some Cripple Creek minerals, including sylvanite, petzite, krennerite, hessite - Ag2Te, tennantite - (Cu,Ag,Fe,Zn)12As4S13, acanthite - Ag2S, and tetrahedrite - (Cu,Fe,Ag,Zn)12Sb4S13.

Geologic unit: Cripple Creek Diatreme, Early Oligocene, 32 Ma

Locality: unrecorded/undisclosed mine in the Cripple Creek Mining District, central Colorado, USA

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Taken on: December 17, 2019

Tags:

Cripple

Creek

ore

Cripple Creek

Colorado

phonolite

Oligocene

diatreme

Cripple Creek Diatreme

calaverite

fluorite « less

Sets appears in: • Colorado Rocks & Fossils • Oligocene Rocks & Fossils more » • Cripple Creek Mining District (Colorado, USA) • Minerals - Tellurides (Calaverite) • Cripple Creek Gold Ores (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Cripple Creek, Colorado, USA) « less

Groups appears in: • Geology of Colorado and Wyoming

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