Nacrite
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Phyllosilicate mineral: group of kaolinite
| Nacrite | |
|---|---|
| Nacrite, "Frohe Hoffnung"-shaft, Wildental, Ore Mountains | |
| General | |
| Category | Phyllosilicates Kaolinite-serpentine group |
| Formula (repeating unit) | Al2Si2O5(OH)4 |
| IMA symbol | Ncr[1] |
| Strunz classification | 9.ED.05 |
| Crystal system | Monoclinic |
| Crystal class | Domatic (m) (same H-M symbol) |
| Space group | Cc |
| Identification | |
| References | [2] [3] |
Nacrite Al 2Si 2O 5(OH)4 is a clay mineral that is polymorphous (or polytypic) with kaolinite.[4] [5] It crystallizes in the monoclinic system. X-ray diffraction analysis is required for positive identification.
Nacrite was first described in 1807 for an occurrence in Saxony, Germany. The name is from nacre in reference to the dull luster of the surface of nacrite masses scattering light with slight iridescences resembling those of the mother of pearls secreted by oysters.
References
[edit ]- ^ 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.
- ^ Mindat Data sheet
- ^ Webmineral data
- ^ "Nacrite". soilsfacstaff.cals.wisc.edu. Retrieved 2024年12月18日.
- ^ "Nacrite". www.mindat.org. Retrieved 2024年12月18日.
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