Gatumbaite

General Information:
 Chemical Formula:
CaAl2(PO4)2(OH)2·(H2O)
 Composition:
(Molecular Weight = 336.01 gm)
Calcium 11.93 % Ca
Aluminum 16.06 % Al
Phosphorus 18.44 % P 
Hydrogen 1.20 % H 
Oxygen 52.38 % O 
 Empirical Formula:
CaAl2(PO4)2(OH)2·(H2O)
 IMA Status:
Approved IMA 1977
 Locality:
Buranga pegmatite, near Gatumba, Gisenyi Province, Rwanda.
 Name Origin:
Named for the locality.
Physical Properties:
 Cleavage:
[???] Good, [???] Good
 Color:
white.
 Density:
2.92
 Diaphaniety:
Translucent
 Habits:
Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat., Rosette - Bundled tabular aggregates resembling rose flower petals., Scaly - Morphology like fish scales.
 Hardness:
4-5 - Fluorite-Apatite
 Luminescence:
Non-fluorescent.
 Luster:
Pearly
 Streak:
white
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