Chemistry:Crandallite
From HandWiki
Short description: Calcium aluminium basic phosphate mineral
| Crandallite | |
|---|---|
 Variscite and crandallite. Locality: Little Green Monster Variscite Mine, Clay Canyon, Fairfield, Oquirrh Mountains, Utah County, Utah, US. Size: 7.8 × 7.3 × 0.4 cm. | |
| General | |
| Category | Phosphate minerals |
| Formula (repeating unit) | CaAl3(PO4)2(OH)5·H2O |
| Strunz classification | 8.BL.10 |
| Dana classification | 42.07.03.01 |
| Crystal system | Trigonal |
| Unit cell | a = 7.005, c = 16.192, Z = 3; V = 688.09 |
| Identification | |
| Formula mass | 414.02 |
| Colour | grey; yellowish |
| Crystal habit | fibrous, compact or massive |
| Cleavage | perfect 0001 |
| Mohs scale hardness | 4 |
| |re|er}} | vitreous to dull |
| Streak | white |
| Density | 2.84 |
| Refractive index | w = 1.618, e = 1.623 |
| Birefringence | 0.0050 |
| References | [1] |
Crandallite is a calcium aluminium basic phosphate mineral. It has ideal formula CaAl3(PO4)2(OH)5·H2O. Crandallite was named after Milan L. Crandall, Jr, who worked for Knight Syndicate. This mineral is found in laterite and in alteration products of phosphate rich pegmatites.
References
- ↑ "Crandallite Mineral Data". http://webmineral.com/data/Crandallite.shtml.
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
 |  |
