28-6-052: altered phonolite - Cripple Creek District - Grassy Valley Mine

Details

Specimen Number28-6-052Alternate NumberJR-97-110Commentsfrom Crowe research collection; J. Rosdeutscher MS materialsIn Teaching CollectionNoMineral(s)kaolinitepyritequartzsericiteField Notesaphanitic phonolite, sericitically altered, py veinlets commonRock Namealtered phonoliteDistrictCripple CreekMineGrassy ValleyGeo-LocationDDHGVC-4 662.5ft.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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28-6-052: altered phonolite - Cripple Creek District - Grassy Valley Mine

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28-6-052: altered phonolite - Cripple Creek District - Grassy Valley Mine