Prehnite 13x16mm Center Drilled Faceted Pear Bead - 15-16 Inch R0911 and beads per strand counts

and beads per strand counts may vary slightly from what is shown

The best available information indicates that the stone is a type of Dolomite that has been altered by volcanic activity

Sonoran Gold is not mined in veins but rather as individual nuggets typically found in clay deposits

the inner lining (nacre) can be iridescent

Common opals are classed as a mineraloid

Prehnite 13x16mm Center Drilled Faceted Pear Bead - 15-16 Inch R0911 and beads per strand countsPrehnite 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.