Smoky quartz with hyalite on black tourmaline Picture jasper and are less likely to

and are less likely to be eaten by their tank-mates due to their especially hard exoskeleton

The crystals are attached to a matrix of light-colored grainy rock

some with smoky-quartz coloration

The iron bands are harder than the surrounding sandstone and create ridges as the softer material is more quickly sandblasted away—just like the material would erode in nature

This is caused by natural etching just like trigons in diamonds

Smoky quartz with hyalite on black tourmaline Picture jasper and are less likely toLocale: Erongo Mountain, Namibia Approx dimensions: 4. 25 x 3 x 2" Approx weight: 437g ** Loose piece on base Smoky quartz from the Erongo region is typically a quite dark brown black color, with lower clarity due to natural inclusions, and a flat surface luster caused by etching. This piece is a bit lighter than usual with some crystal faces glassy clear, providing a window inside. Erongo smoky grows sculptural angular points with nice striations