Weddellite
A variety of Minerals
What is Weddellite?
Weddellite (CaC2O4·2H2O) is a mineral form of calcium oxalate named for occurrences of millimeter-sized crystals found in bottom sediments of the Weddell Sea, off Antarctica. Occasionally, weddellite partially dehydrates to whewellite, forming excellent pseudomorphs of grainy whewellite after weddellite's short tetragonal dipyramids. It was first described in 1942.
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Key Characteristics
Formation of Weddellite
Weddellite occurs as authigenic crystals in sea floor mud. It also has been reported in peat bearing sediments and in calcite-bearing lacustrine sediments. It occurs with whewellite, urea, phosphammite and aphthitalite.
Quick Facts
Physical Properties
- Color
- Colourless, white, yellowish brown to brown; colourless in transmitted light.
- Hardness (Mohs)
- 4
- Density
- 1.962 g/cm³
Chemical Properties
- Chemical Formula
- Ca(C2O4) · (2.5-x)H2O 0 ≤ x ≤ 0.25 Previously reported as CaC2O4·2H2O and CaC2O4·(2+x)H2O
- Elements
- C, Ca, H, O
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