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Crandallite

Summary

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.

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
CategoryPhosphate minerals
Formula
(repeating unit)		CaAl
3(PO
4)
2(OH)
5·H
2O
IMA symbolCdl[1]
Strunz classification8.BL.10
Dana classification42.07.03.01
Crystal systemTrigonal
Unit cella = 7.005, c = 16.192, Z = 3; V = 688.09
Identification
Formula mass414.02
Colourgrey; yellowish
Crystal habitfibrous, compact or massive
Cleavageperfect 0001
Mohs scale hardness4
Lustervitreous to dull
Streakwhite
Density2.84
Refractive indexw = 1.618, e = 1.623
Birefringence0.0050
References[2]

References edit

  1. ^ 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.
  2. ^ "Crandallite Mineral Data". webmineral.com.