Minerals & Gemstone 480x104
Minerals & Gemstone 480x104
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Glossary of Terms
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ALL



Obsidian
Volcanic rock highly rich in silica that is a natural glass. Obsidian is formed by the cooling of molten lava.



Obsidian from Italy

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