| 9hlnawi ((POTASSIUM ALUM)), $5 MINIMUM BID, Alum Mine, Silver Peak, Esmeralda County, Nevada, 2 x 2 x 2 cm, Thumbnail | |
 | A sulphate aka Alum-K This is a specimen from the Neil Wintrigham collection. Neil wrote the book on Maine minerals. ex Neil A Wintringham collection. |
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