Mineral Monday is a weekly video series exploring the many amazing minerals, fossils, and historic objects on display at the W.M. Keck Earth Science and Mineral Engineering Museum as told by museum ...

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Opals, as hydrated forms of silica, encompass a wide range of materials formed by both biogenic and diagenetic processes. The genesis of opal involves precipitation from silica‐rich fluids and ...

Opal discovered in Fremont County has triggered interest in the area. LANDER - Would-be opal prospectors and miners lined up 50-deep Friday morning to buy a 12-page report about an opal deposit in the ...