Black tourmaline and smoky quartz on albite matrix with hyalite Rhyolite Native to Europe

Native to Europe

Keepers usually advise to remove food mold that may entrap mancae (baby isopods)

don't blind the poor guys)

This material would most accurately be named "chrysanthemum rhyolite" but you know I can't pass up a goblin-y name like spider jasper

The rounded white crystal near it is radial-growth quartz

Black tourmaline and smoky quartz on albite matrix with hyalite Rhyolite Native to EuropeLocale: Erongo Mountain, Namibia Approx dimensions: 4. 5 x 4 x 1. 5" Approx weight: 728g (1. 6 lbs) This large specimen is one of my favorites of the Erongo black tourmaline, known as schorl. The piece is a rough aggregate of minerals appearing to contain albite, schorl, and smoky quartz. The front is nearly entirely covered with dozens of blocky small schorl crystals, some displaying the Mercedes termination characteristic of the Erongo region.