Difference between revisions of "Weddellite"
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== Description == | == Description == | ||
| − | A white, glassy mineral composed of [ | + | A white, glassy mineral composed of [[calcium%20oxalate|calcium oxalate]] dihydrate. Weddellite, and [[whewellite|whewellite]], are two calcium oxalate minerals which form on the surface of carbonaceous minerals in the presence of microbiological organisms such as [[lichen|lichens]]. The mineral obtained its name when small crystals of weddellite were found in the sediment of the Weddell Sea near Antartica. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Revision as of 12:13, 10 May 2016
Description
A white, glassy mineral composed of Calcium oxalate dihydrate. Weddellite, and Whewellite, are two calcium oxalate minerals which form on the surface of carbonaceous minerals in the presence of microbiological organisms such as lichens. The mineral obtained its name when small crystals of weddellite were found in the sediment of the Weddell Sea near Antartica.
Synonyms and Related Terms
weddelite (sp); calcium oxalate; wedelita (Esp.); weddelite (Port.); Weddelit (Deut.)
Other Properties
Colorless, transparent, tetragonal crytals. Luster = vitreous Streak = white Fracture = conchoidal
| Composition | Ca(C2O4)-2H2O |
|---|---|
| Mohs Hardness | 4.0 |
| Density | 2.02 |
| Molecular Weight | 164.13 |
| Refractive Index | w=1.523, e=1.544 |
Additional Information
° Mineralogy Database: Weddellite ° M. del Monte, C. Sabbioni, G.Zappia. The origin of calcium oxalates on historical buildings, monuments and natural outcrops. The science of the total environment 67, (1987), pp. 17-39 ° B. Ford, I.MacLeod, P.Haydock, "Rock art pigments from Kimberley region of Western Australia: identification of the minerals and conversion mechanisms." Studies in conservation 39, no. 1 (1994), pp. 57-69
Sources Checked for Data in Record
- Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Weddellite (Accessed Sept 2, 2005)