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Acuminite

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Acuminite
Acuminite is a rare halide mineral of with chemical formulaSrAlF4(OH)·(H2O). Its name comes from the Latin word acumen, meaning "spear point". Its Mohs scale rating is 3.5.

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Mineralogy Database Dictionary

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Acuminite

General Information:
 Chemical Formula:
SrAlF4(OH)·(H2O)
 Composition:
(Molecular Weight = 225.62 gm)
Strontium 38.84 % Sr
Aluminum 11.96 % Al
Hydrogen 1.34 % 
Oxygen 14.18 % 
Fluorine 33.68 % 
 Empirical Formula:
SrAlF4(OH)·(H2O)
 IMA Status:
Approved IMA 1985
 Locality:
TL: Greenland, Ivigtut
Physical Properties:
 Cleavage:
[???] Perfect
 Color:
colorless.
 Density:
3.295
 Diaphaniety:
Transparent
 Hardness:
3.5 - Copper Penny
 Luster:
Vitreous (Glassy)
 Streak:
white
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