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Amethyst is a purple variety of quartz
Rainbow Obsidian is another form of Sheen Obsidian that gets its iridescent sheen from inclusions of magnetite nano-particles
First photo is shown under long-wave UV light
The Tyndall effect is also the reason why blue chalcedony appears yellow or brown when strong light shines through it
Chifeng City
Pink Halite on Trona Specimen DS557 square Amethyst is a purple varietyPink Halite on Trona Specimen Approx. Dimensions: 3x2. 5x1. 75 inches Approx. Weight: 111 grams Locality: Owens Lake, Inyo County, California Acrylic display stand not included. Halite on trona from Owens Lake, California, represents a unique geological occurrence where two minerals, halite (common salt) and trona (a sodium carbonate mineral), coexist in a visually striking formation. Owens Lake, located in the Eastern Sierra Nevada region, was
