General Information:
Chemical Formula:KAl2(PO4)2(OH)·2(H2O)
Composition:(Molecular Weight = 336.04 gm)Potassium 11.63 %
K Aluminum 16.06 %
AlPhosphorus 18.43 %
P Hydrogen 1.50 %
H Oxygen 52.37 %
O Empirical Formula: KAl2(PO4)2(OH)·2(H2O)
Environment:Found in highly altered triphylite pods in the intermediate zone of the pegmatite.
IMA Status:Approved IMA
Locality:Tip Top pegmatite, 8.8 km SE of Custer, Custer County, South Dakota, USA.
Name Origin:Named for Frank C. Tinsley (1916-), mineral collector, Black Hills specialist of Rapid City, South Dakota, USA.
Physical Properties: Cleavage:None
Color:dark red.
Density:2.69
Diaphaniety:Translucent
Habits:Tabular - Form dimensions are thin in one direction., ,
Hardness:5 - Apatite
Luster:Vitreous (Glassy)
Streak:pink
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