Cronstedtite
In today's world, Cronstedtite is a topic that has gained great relevance and has captured the attention of a wide spectrum of society. Since its emergence, Cronstedtite has been the subject of debate and discussion in different areas, arousing both interest and controversy. As time progresses, the importance of Cronstedtite becomes increasingly evident, significantly impacting different aspects of daily life. In this article, we will thoroughly explore the phenomenon of Cronstedtite, analyzing its many facets and its impact on today's society.
| Cronstedtite | |
|---|---|
 Cronstedtite – Salsigne Mine – France | |
| General | |
| Category | Phyllosilicate minerals, kaolinite-serpentine group, serpentine subgroup |
| Formula | Fe2+ 2Fe3+ (Si,Fe3+ O 5)(OH) 4 |
| IMA symbol | Cro[1] |
| Strunz classification | 9.ED.15 |
| Crystal system | Trigonal |
| Crystal class | Ditrigonal pyramidal (3 m) (same H-M symbol) |
| Space group | P31m (no. 157) |
| Unit cell | a = 5.486 Å, c = 7.095 Å; Z = 1[2] |
| Identification | |
| Color | Black, dark brown-black, green-black |
| Cleavage | Perfect on {001} |
| Tenacity | Elastic |
| Luster | Sub-Metallic |
| Streak | Dark olive green |
| Diaphaneity | Translucent |
| 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 iron silicate mineral belonging to the 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 Swedish 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
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b Webmineral.com
- ^ Mindat.org
- ^ American Mineralogical Society
- ^ Browning, Lauren B.; McSween, Harry Y.; Zolensky, Michael E. (1996). "Correlated alteration effects in CM carbonaceous chondrites". Geochimica et Cosmochimica Acta. 60 (14): 2621–2633. doi:10.1016/0016-7037(96)00121-4. ISSN 0016-7037.
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