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File:Calaverite-fluorite vein (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Cripple Creek Mining District, Colorado, USA) 3.jpg

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English: Calaverite-fluorite vein from the Oligocene of Colorado, USA. (public display, Denver Museum of Nature & Science, Denver, Colorado, USA)

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 argentian 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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Source https://www.flickr.com/photos/47445767@N05/49216406886/
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49216406886 (archive). It was reviewed on 22 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

22 December 2019

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