Obsidian
Black obsidian is a naturally occurring volcanic glass formed from rapidly cooled lava, commonly sold as polished specimens, rough rocks, or carved items for collectors and hobbyists.
Estimated value as of 2026 · Source: Retail mineral dealers including FossilEra.com, The Fossil Cartel, and The Gem S…
Fun Fact
Obsidian was used by ancient civilizations to create sharp tools and arrowheads due to its conchoidal fracture pattern, producing edges sharper than modern surgical steel.
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