Large black tourmaline with hyalite Aragonite They have a yellowish coloration

They have a yellowish coloration under the surface with some transparency

It especially highlights structure of the hydroxyapophyllite crystals of this piece

Red quartz is often muted and not quite as glittery as other varieties

The alternating zones of green and purple muddle to give the material its inky grape-soda appearance

'Oxide' means that the metallic element of the mineral's chemical compound has oxidized like rust as the mineral eroded over geologic time

Large black tourmaline with hyalite Aragonite They have a yellowish colorationLocale: Erongo Mountain, Namibia Approx dimensions: 3. 25 x 2. 5 x 2. 25" Approx weight: 645g This large glossy black tourmaline, known as schorl, has the Mercedes termination characteristic of the Erongo region with intricate growth patterns across the faces of the tip. The sides are beautifully striated, with fine vertical lines and a chunkier accordion zig zag to the sides of the crystal. Erongo schorl typically has very high luster as seen in this