Brown Derby Mine, Quartz Creek Pegmatite Mining District, Gunnison County, Colorado
Small cabinet - 8.1 x 4.0 x 2.7 cm
77 grams
Specimen status: Reserved
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Opaque, greenish black tourmaline -
massive to crystalline - with a brown mica species
(biotite?) in a feldspar matrix. This photogenically
challenged rock is best considered a species/locality
specimen.
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