Large black tourmaline with hyalite Aragonite They have a yellowish coloration

They have a yellowish coloration under the surface with some transparency

which is also found at this locale

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

A snow-drift of white quartz flows out of the darkness

It especially highlights structure of the hydroxyapophyllite crystals of this piece

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