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Obsidian: Igneous Rock - Pictures, Uses, Properties
Obsidian Value, Price, and Jewelry Information - International Gem Society
Obsidian Vs. Onyx: What's The Difference? - Beadnova
Raw Obsidian, Igneous Rock Specimen - Approx. 1"- Geologist Selected & Hand Processed - Great for Science Classrooms - Eisco Labs: Amazon.com: Industrial & Scientific
Black Obsidian Spalls - Flint Knapping Stone & Supplies | GoKnapping
Obsidian in the Upper Palaeolithic of Iberia | Antiquity | Cambridge Core