Alfredo Petrov and an Opal Sulfur Dilemma

S omething is different  in Tucson this year. Alfredo Petrov and his inventory of  mostly unusual specimens with precise handwritten labels...
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Leesite: Another New Species Discovered by Patrick Haynes

Leesite Patrick Haynes In   1989, Patrick Haynes collected what 27 years later would become the new uranyl oxide micromine...
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