General Information:
Chemical Formula:
HFe++3Al2(PO4)4F·18(H2O)
Composition:
(Molecular Weight = 945.67 gm)
Aluminum 5.71 % Al
Iron 17.72 % Fe
Phosphorus 13.10 % P
Hydrogen 3.94 % H
Oxygen 57.52 % O
Fluorine 2.01 % F
Empirical Formula:
HFe2+3Al2(PO4)4F·18(H2O)
Environment:
Complex supergene enrichment area of iron phospates.
IMA Status:
Approved IMA
Locality:
East Kemptville tin mine, Yarmouth County, NS, Canada.
Name Origin:
Named for David A. McAuslan, exploration manager, Shell Canada Resources LTD., who discovered the locality.
Physical Properties:
Cleavage:
[110] Good
Color:
colorless or yellowish white.
Density:
2.22
Diaphaniety:
Translucent
Habits:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Fibrous - Crystals made up of fibers.
Hardness:
3.5 - Copper Penny
Luster:
Vitreous - Silky
Streak:
white
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