Tancoite

General Information:
 Chemical Formula:
HNa2LiAl(PO4)2(OH)
 Composition:
(Molecular Weight = 287.86 gm)
Sodium 15.97 % Na
Lithium 2.41 % Li
Aluminum 9.37 % Al
Phosphorus 21.52 % P 
Hydrogen 0.70 % H 
Oxygen 50.02 % O 
 Empirical Formula:
LiNa2HAl(PO4)2(OH)
 IMA Status:
Approved IMA 1979
 Locality:
Tanco spodumene-bearing pegmatite mine at Bernic Lake, MB, Canada.
 Name Origin:
Named for the locality.
Physical Properties:
 Cleavage:
[010] Distinct, [001] Distinct
 Color:
colorless or light pink.
 Density:
2.752
 Diaphaniety:
Transparent
 Habits:
Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces., Columnar - Forms columns,
 Hardness:
4-4.5 - Between Fluorite and Apatite
 Luster:
Vitreous (Glassy)
 Streak:
white
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