General Information:
Chemical Formula:
Na2(Ti,Fe+++)Si4(O,F)11
Environment:
Pegmatite dikes.
Locality:
Narsarsuk, southern Greenland.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[???] Good, [???] Good
Color:
brown, brownish gray, colorless, green, or honey yellow.
Density:
2.7
Diaphaniety:
Transparent to translucent
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
7 - Quartz
Luster:
Vitreous (Glassy)
Streak:
white
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