9/13/2023 0 Comments Black and red obsidianTo really bring out the shine and clarity you may have to rinse off, polish, tumble or cab the stones while receiving the stones. It usually colours dark, black, grey-black to grey. Result of this formed, glass occupies more than 80 and that have seeming conchoidal fracture and vitreous luster. It is usually an opaque black or grey but may be yellow, red, greenish brown. It is occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes.
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