Prehnite 8mm Double Heart Faceted - 15-16 Inch R1585 currently believed to be due

currently believed to be due to the presence of a copper-based mineral such as Malachite or Azurite

deep-blue copper mineral produced by weathering of copper ore deposits

The first rough material was offered for sale in Tucson in 2011 and is now regularly mined at the remote deposit site in Sonora

Turquoise is now mined all over the world

The green coloring has likened the stone of jadeite in the past

Prehnite 8mm Double Heart Faceted - 15-16 Inch R1585 currently believed to be duePrehnite 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.