is a Lead Zinc Vanadate Hydroxide with formula PbZn(VO4)(OH) and hardness of 3-3.5 .
Is not known as cut gemstones,but popular among mineral collectors.Usually the crystal are small and have a flat shapes,therefore is difficult to have large cut stones.
This material comes from Berg Aukus, Namibia and is translucent to transparent.Due to it’s heavy specific weight of 6.2 , the luster is adamantine.
A collector stone!
Weight: 2.55 ct.
Size: 11.2x7.4x5 mm.