Black tourmaline and smoky quartz on albite matrix with hyalite Coprolite These sandstone coasters are made

These sandstone coasters are made of Arizona Sierra sandstone sourced from central Arizona

” “womb stone

Approx dimensions: 3 x 2

and can show fibrous radial patterns

and Cubaris sp

Black tourmaline and smoky quartz on albite matrix with hyalite Coprolite These sandstone coasters are madeLocale: 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.