Otavite

Otavite is a rare cadmium carbonate mineral with the formula CdCO₃. Otavite crystallizes in the trigonal system and forms encrustations and small scalenohedral crystals that have a pearly to adamantine luster. The color is white to reddish to yellow brown. Its Mohs hardness is 3.5 to 4 and the specific gravity is 5.04. Associated minerals include azurite, calcite, malachite, and smithsonite.

Otavite
Otavite, Tsumeb, Oshikoto Region, Namibia
General
Category	Carbonate minerals
Formula	CdCO3
IMA symbol	Ota[1]
Strunz classification	5.AB.05
Crystal system	Trigonal
Crystal class	Hexagonal scalenohedral (3m) H-M symbol: (3 2/m)
Space group	R3c

It was first described in 1906 from the Tsumeb district near Otavi, Namibia.