Prehnite Natural 8mm Bicone Faceted - 15-16 Inch Gemstone Turquoise is one of the

Turquoise is one of the oldest known gemstones

It is a variety of banded Chalcedony with layers that may contain scarlet

Azurite in crystal form is extremely rare and expensive

the resulting rock is dark gray to deep black in color and riddled with pits and holes where air was trapped in the stone

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

Prehnite Natural 8mm Bicone Faceted - 15-16 Inch Gemstone Turquoise is one of thePrehnite 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.