Image: Spodumene - large crystals in granite - Etta mine, Keystone, Pennington County, South Dakota
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Description: Large crystals of Spodumene in granite dike. Etta Mines, near Keystone — Black Hills, Pennington County, South Dakota. 1908. Plate 7 in U.S.Geological Survey. Folio 219. 1925.
Title: Spodumene - large crystals in granite - Etta mine, Keystone, Pennington County, South Dakota
Credit: http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Paige,%20S.%201220
Author: U.S.Geological Survey
Usage Terms: Public domain
License: Public domain
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