General Information:
Chemical Formula:
KAl2(PO4)2(OH)·2(H2O)
Composition:
(Molecular Weight = 336.04 gm)
Potassium 11.63 % K
Aluminum 16.06 % Al
Phosphorus 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
More details...