General Information:
Chemical Formula:
K(Li,Al,Mn++)3[(Si,Al)4O10](F,OH)2
Composition:
(Molecular Weight = 402.17 gm)
Potassium 9.72 % K
Lithium 3.45 % Li
Manganese 6.83 % Mn
Aluminum 10.06 % Al
Silicon 20.95 % Si
Hydrogen 0.13 % H
Oxygen 41.77 % O
Fluorine 7.09 % F
Empirical Formula:
KLi2Al0.5Mn2+0.5Si3AlO10F1.5(OH)0.5
Environment:
Li pegmatites.
IMA Status:
Approved IMA 1975
Locality:
Tanakamiyama district, Shiga Prefecture, Honshu, Japan.
Name Origin:
Named for Kazunosuke Masutomi, Japanese pharmacist and prominent amateur mineralogist and mineral collector.
Physical Properties:
Cleavage:
[001] Perfect
Color:
purple pink.
Density:
2.94
Diaphaniety:
Transparent to Translucent
Habits:
Pseudo Hexagonal - Crystals show a hexagonal outline., ,
Hardness:
2.5 - Finger Nail
Luster:
Vitreous - Pearly
Streak:
white
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