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Gold Sheen Obsidian Medusa Carving
The formation of dendritic opal involves the infiltration of mineral-rich water into rock cavities
and this obelisk is near perfect
this is a cool plate with lovely little blastoid and two large crinoid fossils embedded in a matrix with dozens of other small crinoid pieces
Pink Fluorite with Byssolite Inclusions
Polished Dugway Geode Half DX231 tube agate Gold Sheen Obsidian Medusa CarvingDugway Geode Approx. Dimensions: 3. 5 x 3. 5 x 2" Approx. Weight: 474 grams Locality: Dugway Geode Beds, Juab County, Utah Includes three prong geode stand This piece reacts to short and long wave ultraviolet light, shown in the last two photos. Many portions of the inside of the geode glow a vibrant green. The fluorescence is due to trace amounts of uranium present in the quartz and chalcedony. Approximately 6 to 8 million years ago (Miocene epoch),
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