Crandallite
Calcium aluminium basic phosphate mineral / From Wikipedia, the free encyclopedia
Crandallite is a calcium aluminium basic phosphate mineral. It has ideal formula CaAl
3(PO
4)
2(OH)
5·H
2O.
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.
Quick Facts General, Category ...
Crandallite | |
---|---|
General | |
Category | Phosphate minerals |
Formula (repeating unit) | CaAl 3(PO 4) 2(OH) 5·H 2O |
IMA symbol | Cdl[1] |
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 |
Luster | vitreous to dull |
Streak | white |
Density | 2.84 |
Refractive index | w = 1.618, e = 1.623 |
Birefringence | 0.0050 |
References | [2] |
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