General Information:
Chemical Formula:
Na8Al6Si6O24(SO4)
Composition:
(Molecular Weight = 1,012.38 gm)
Sodium 18.17 % Na
Aluminum 15.99 % Al
Silicon 16.65 % Si
Hydrogen 0.20 % H
Sulfur 3.17 % S
Oxygen 45.83 % O
Empirical Formula:
Na8Al6Si6O24(SO4)·(H2O)
Environment:
Igneous rocks low in silica and rich in alkalies.
Locality:
Laacher See in the Eifel district of Rhineland.
Name Origin:
Named after the German mineralogist, K. W. Nose (1753-1835).
Physical Properties:
Cleavage:
[110] Perfect
Color:
white, gray, blue, green, or brown.
Density:
2.3 - 2.4, Average = 2.34
Diaphaniety:
Transparent to Translucent
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., ,
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luminescence:
Fluorescent.
Luster:
Vitreous - Greasy
Streak:
bluish white
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