Huge Velvet Obsidian Slab – Flashy Mexican Lapidary Stone with Color Shifts Green River Wyoming They’re actually the fossilized boring

They’re actually the fossilized boring tunnels of shipworm larvae (Teredo) that burrowed into the wood during the Cretaceous period before it petrified

Old Time rock hounds use to love this material as it grinds easy

Once-common

This is a rare and visually striking piece of Labradorite rough from Madagascar featuring hard-to-find purple flash

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Huge Velvet Obsidian Slab – Flashy Mexican Lapidary Stone with Color Shifts Green River Wyoming They’re actually the fossilized boringVelvet Obsidian Slab Large Old Stock with Intense Flash and Rare Color Play This is a massive slab of Mexican Velvet Obsidian, absolutely packed with vivid flash and layered velvet patterning. Velvet Obsidian is already a rare material, but finding it in a slab this large is exceptionally uncommon. Most pieces come out as small, trimmer sized chunksthis slab is a true collectors opportunity. Measurements (inches longest approx.): 8. 9 x 5. 9 x 0. 30