Cronstedtite
| Cronstedtite | ||
|---|---|---|
Specific gravity 3.34 – 3.35 | | |
| Optical properties | Biaxial (−) | |
| Refractive index | nα = 1.720 nβ = 1.800 nγ = 1.800 | |
| Birefringence | δ = 0.080 | |
| Pleochroism | Visible | |
| Dispersion | r < v moderate | |
| References | [2][3][4] | |
Cronstedtite is a complex
serpentine group
of minerals. Its chemical formula is Fe2+2Fe3+
(Si,Fe3+
O
5)(OH)
4.
It was discovered in 1821 and named in honor of
mineralogist Axel Fredrik Cronstedt (1722–1765). It has been found in Bohemia in the Czech Republic and in Cornwall, England
.
Cronstedtite is a major constituent of CM chondrites, a carbonaceous chondrite group exhibiting varying degrees of aqueous alteration. Cronstedtite abundance decreases with increasing alteration.[5]
See also
References
Wikimedia Commons has media related to Cronstedtite.
- S2CID 235729616.
- ^ a b Webmineral.com
- ^ Mindat.org
- ^ American Mineralogical Society
- ^ Browning et al. (1996) Geochimica et Cosmochimica Acta
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