Prehnite 4mm Faceted Bicone - 15-16 Inch Dendritic Opal it has often been used

it has often been used as a substitute

These flecks glitter as they catch the light and appear green against the dark glass

it offers a way to work a neutral color into your designs

a silicate of calcium and magnesium -- from western Canada

giving it a naturally harder composition and a slightly waxy luster even before stabilization

Prehnite 4mm Faceted Bicone - 15-16 Inch Dendritic Opal it has often been usedPrehnite 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.