Botryoidal Hyalite Opal - Namibia, Africa
Size: 52x50x21mm
Approximate Weight: 32 grams
Locality: Erongo Mountains, Karibib Constituency, Erongo Region, Namibia
Photographed with indoor, outdoor and 365nm light
Formula: SiO2 · nH2O
Hyalite is a form of amorphous silica featuring a glassy luster and characteristic botryoidal (grape-like) growth habits. While pure hyalite opal is water-clear, specimens with a higher abundance of uranium exhibit a distinct yellowish-green body color even under normal indoor and daylight conditions.
Fluorescence demonstrated at 365 nm UV light
Devices and coin not included
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