Prehnite 8mm Round AAA Grade - 15-16 Inch AA Gade more commonly referred to as

more commonly referred to as simply Australian Opal

” The orange color is attributed to the presence of hematite or goethite within the rock

Its needle to like inclusions of hematite are iridescent red

It is a white granite with dark gray mottling that also exhibits blue or green spots

Prehnite 8mm Round AAA Grade - 15-16 Inch AA Gade more commonly referred to asPrehnite 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.