28-6-051: altered phonolite - Cripple Creek District - Grassy Valley Mine

Details

Specimen Number28-6-051Alternate NumberJR-97-109Commentsfrom Crowe research collection; J. Rosdeutscher MS materialsIn Teaching CollectionNoMineral(s)kaolinitepyritequartzsericiteField Notesaphanitic phonolite, strongly sericitized w/ abun. py veinletsRock Namealtered phonoliteDistrictCripple CreekMineGrassy ValleyGeo-LocationDDHGVC-4 638ft.Deposit TypeDiatremeGeo-Coords^[1]Reference MaterialRosdeutscher, J.A., 1999, Geology and Stable Isotope Geochemistry of the Grassy Valley Au Deposit, Cripple Creek District, Colorado: Evidence for Magmatic Fluids; University of Georgia MS thesis, 76 p.

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28-6-051: altered phonolite - Cripple Creek District - Grassy Valley Mine

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28-6-051: altered phonolite - Cripple Creek District - Grassy Valley Mine