General Information: Chemical Formula:Na4AlBeSi4O12Cl
Composition:(Molecular Weight = 467.74 gm)
Sodium 19.66 %
NaBeryllium 1.93 %
BeAluminum 5.77 %
AlSilicon 24.02 %
SiChlorine 7.58 %
ClOxygen 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
More details...