Chemistry:Wood opal
From HandWiki
Short description: Gemstone made of petrified wood
Wood opal, also known as xylopal,[1][2] is a form of petrified wood which has developed an opalescent sheen or, more rarely, where the wood has been completely replaced by opal. Other names for this opalized sheen-like wood are opalized wood and opalized petrified wood. It is often used as a gemstone.[3]
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