General Information:
Chemical Formula:
CaAl3(PO4)2(OH)5·(H2O)
Composition:
(Molecular Weight = 414.02 gm)
Calcium 9.68 % Ca
Aluminum 19.55 % Al
Phosphorus 14.96 % P
Hydrogen 1.70 % H
Oxygen 54.10 % O
Empirical Formula:
CaAl3(PO4)2(OH)5·(H2O)
Environment:
Lateritic phosphate deposits and alteration of petmatitic phosphate minerals.
Locality:
Brooklyn mine, near Silver City, Tintic district, Juab County, Utah, USA.
Name Origin:
Named for Milan L. Crandall, Jr., engineer, Knight Syndicate, Provo, Utah, USA.
Physical Properties:
Cleavage:
[0001] Perfect
Color:
gray, yellow, yellowish white, or light red.
Density:
2.78 - 2.92, Average = 2.84
Diaphaniety:
Transparent to Subtranslucent
Habits:
Compact - Occurs as a compact mass., Massive - Granular - Common texture observed in granite and other igneous rock., Fibrous - Crystals made up of fibers.
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Dull
Streak:
white
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