Prehnite 4mm Faceted Bicone - 15-16 Inch Dendritic Opal Agate has been discovered with

Agate has been discovered with artifacts from cultures of the Neolithic Period

It is a rare occurrence to find gem-grade hackmanite

it has often been used as a substitute

Essentially a volcanic glass

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

Prehnite 4mm Faceted Bicone - 15-16 Inch Dendritic Opal Agate has been discovered withPrehnite 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.