THE MINERAL OTAVITE
- Chemistry: CdCO3, Cadmium Carbonate.
- Class: Carbonate.
- Group: Calcite.
- Uses: A minor ore of cadmium and as mineral specimens.
Otavite is a rare mineral from the famous mines of
Otavi (hence the name), Namibia.
It is one of only a few cadmium minerals as cadmium is usually a trace element in other minerals.
Other cadmium minerals include:
Native elemental cadmium;
and the arsenate
All are rare minerals, as is otavite.
Otavite is a member of the
Most other members of this group are quite common and include such well known minerals as
- Color is usually white, but can also be yellowish brown, reddish brown and brown.
- Luster is adamantine to pearly.
- Transparency crystals are usually translucent to transparent.
- Crystal System is trigonal; bar 3 2/m.
- Crystal Habits are limited to crusts and tiny scalahedral crystals.
- Cleavage is perfect in 3 non-perpendicular directions forming rhombs.
- Fracture is conchoidal.
- Hardness is 3.5 - 4.
- Specific Gravity is 5 (very heavy for a translucent mineral).
- Streak is white.
- Other Characteristics: Effervesces with acid and some specimens have fluoresced red under shortwave UV light.
- Associated Minerals includes
- Notable Occurrences include the type locality of
Otavi (hence the name), Namibia; Blanchard Mine, New Mexico, USA and Broken Hill, New South Wales, Australia.
- Best Field Indicators are density, reaction to acids, cleavage, color and locality.