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Coral is the skeletons of once to living sea coral, composed of hard calcium carbonate, colored by carotenoids. The colors of coral are permanent a...

Botswana Agate displays highly defined parallel banding, usually in white on hues of brown, gray, pink, tan, apricot and purplish red. Botswana Aga...

This variety of opal is named "dendritic" for the small inclusions within it that resemble moss or ferns. These inclusions consist of iron, mangane...