Otavite

Otavite is a rare cadmium carbonate mineral with 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.
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General Information:
 Chemical Formula:
CdCO3
 Composition:
(Molecular Weight = 172.42 gm)
Cadmium 65.20 % Cd
Carbon 6.97 % C 
Oxygen 27.84 % O 
 Empirical Formula:
Cd(CO3)
 Locality:
Tsumeb, near Otavi (Namibia).
 Name Origin:
Named after its locality.
Physical Properties:
 Cleavage:
[1011] Perfect, [1011] Perfect, [1011] Perfect
 Color:
yellow brown, white, reddish, or reddish white.
 Density:
5.03
 Diaphaniety:
Transparent to Translucent
 Habits:
Encrustations - Forms crust-like aggregates on matrix., Euhedral Crystals - Occurs as well-formed crystals showing good external form.,
 Hardness:
3.5-4 - Copper Penny-Flourite
 Luminescence:
Fluorescent.
 Luster:
Adamantine - Pearly
 Streak:
white
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