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)	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]

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.

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