Prehnite 10mm Round AAA Grade - 15-16 Inch Barrel Blue deep-blue copper mineral produced by

deep-blue copper mineral produced by weathering of copper ore deposits

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Cubic Zirconia can be truly colorless

usually in white on hues of brown

naturally occurring mineral composed of pure carbon

Prehnite 10mm Round AAA Grade - 15-16 Inch Barrel Blue deep-blue copper mineral produced byPrehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is translucent to transparent, in colors from light green to yellow green to olive, with occasional inclusions of Black Tourmaline that crisscross the stone in fibrous patterns. It is a phyllosilicate composed of silicon, calcium and aluminum with trace amounts of iron.