Prehnite 9x13mm Long Faceted Heart Bead - 15-16 Inch Stone Type_Apatite and colors that include purples

and colors that include purples

While sometimes marketed as jasper

Opal is a natural gemstone made from silica mineral and 90% are found in Australia

It sometimes features dark brown to black dendritic inclusions that branch like tiny tree limbs through the stone

Prehnite 9x13mm Long Faceted Heart Bead - 15-16 Inch Stone Type_Apatite and colors that include purplesPrehnite 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.