Prehnite 4mm Round AAA Grade - 15-16 Inch 16-inch Rounds bubbles and crystal-rich layers that

bubbles and crystal-rich layers that form as lava flows onto the surface of stone —

Emerald and Heliodore -- and is often cut to highlight its chatoyant qualities

Sardonyx is sometimes treated to bring out its reddish tones

oil and succinic acid

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Prehnite 4mm Round AAA Grade - 15-16 Inch 16-inch Rounds bubbles and crystal-rich layers thatPrehnite 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.