Prehnite 10mm Round AAA Grade - 15-16 Inch Square Donut Jasper is an opaque

Jasper is an opaque

and bold black spiderweb matrix—creating highly distinctive

a banded Chalcedony that is predominantly white with layers of brown

Rainbow Obsidian earned its name from the chatoyant

firely new look to these stones

Prehnite 10mm Round AAA Grade - 15-16 Inch Square Donut Jasper is an opaquePrehnite 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.