Obsidian occurance, Milford, Escalante Desert, Beaver Co., Utah, USA
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List of minerals arranged by Dana 8th Edition classification
|Group 75 - TECTOSILICATES Si Tetrahedral Frameworks|
|Si Tetrahedral Frameworks - SiO2 with  coordinated Si|
2 entries listed. 1 valid mineral.
Kapple, William: Rockhounding Utah.