Obsidian (locale unknown)
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SKU
TR235755
Obsidian (volcanic glass of rhyolite composition) from an unknown location. Exhibits classic conchoidal fracture, and is transparent when thin edges are viewed in good light. Also has banding characteristic of rhyolite lava flows.
Large cabinet specimen: about 4.1" x 1.7" x 1.6" (105mm x 43mm x 40mm)