Gigantic crystals of spodumene, Etta Mines; molds of two immense crystals. Black Hills, Pennington County, South Dakota.
Dates
Date Taken
1904
Summary
Gigantic crystals of spodumene, Etta Mines; molds of two immense crystals. Black Hills, Pennington County, South Dakota. 1904. Plate i-B in U.S. Geological Survey. Bulletin 610. 1916.
Summary
Gigantic crystals of spodumene, Etta Mines; molds of two immense crystals. Black Hills, Pennington County, South Dakota. 1904. Plate i-B in U.S. Geological Survey. Bulletin 610. 1916.
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