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Obsidian is formed when lava extruded from volcanos rapidly cools with little to no crystal growth
Natrolite Geode
sometimes with hints of yellow or brown
Turgite from Durango
and medical diagnostics
Sulfur on Aragonite from Cozzo Disi Mine TF1262 yoda pocket Obsidian is formed when lavaSulfur on Aragonite from Cozzo Disi Mine Approx. Dimensions: 5x4x2. 25 inches Approx. Weight: 414 grams Locality: Cozzo Disi Mine, Casteltermini, Agrigento, Sicily, Italy This large aragonite specimen features several well formed sulfur crystals scattered throughout. This piece is from the Cozzo Disi Mine in Sicily, Italy. Aragonite from this region is phosphorescent, so it will hold a UV charge briefly after the UV light is removed.
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