General Information:
Chemical Formula:
Na4AlBeSi4O12Cl
Composition:
(Molecular Weight = 467.74 gm)
Sodium 19.66 % Na
Beryllium 1.93 % Be
Aluminum 5.77 % Al
Silicon 24.02 % Si
Chlorine 7.58 % Cl
Oxygen 41.05 % O
Empirical Formula:
Na4AlBe(Si4O12)Cl
IMA Status:
Approved IMA 1963
Name Origin:
Named after its locality Tugtup, Greenland.
Physical Properties:
Cleavage:
[111] Imperfect
Color:
white, pink, crimson, blue, or green.
Density:
2.36
Diaphaniety:
Transparent to Translucent
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:
4 - Fluorite
Luminescence:
Fluorescent.
Luster:
Vitreous - Greasy
Streak:
white
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