Prehnite 6mm Round Faceted A Grade - 15-16 Inch HPS_07202023 black or brown veins running

black or brown veins running through it in web-like patterns

resulting in fossils that are chalk-white

making it suitable for jewelry design while maintaining its natural appearance

after its type locality

Prehnite 6mm Round Faceted A Grade - 15-16 Inch HPS_07202023 black or brown veins runningPrehnite 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.