Large black tourmaline with hyalite Aragonite Approx weight: 8–12g

Approx weight: 8–12g

Inclusions make the point near-opaque with a gradient to translucent at the base

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

They have a yellowish coloration under the surface with some transparency

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

Large black tourmaline with hyalite Aragonite Approx weight: 8–12gLocale: 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