General Information:
Chemical Formula:
(Na,Ca)8(Si68Al12)O160-29(H2O)
Composition:
(Molecular Weight = 5,534.03 gm)
Sodium 2.49 % Na
Calcium 1.45 % Ca
Aluminum 5.85 % Al
Silicon 34.51 % Si
Hydrogen 1.06 % H
Oxygen 54.64 % O
Empirical Formula:
Na6Ca2Si68Al12O160·29(H2O)
Environment:
In cavites in dolorites.
IMA Status:
Approved IMA 1995
Locality:
The southwest crest, just below the summit of Mt. Adamson, Northern Victoria Land, Antarctica.
Name Origin:
For the Italian Antarctic Station at Terranova Bay, Antarctica.
Physical Properties:
Cleavage:
[010] Perfect, [001] Parting
Color:
colorless or bluish white.
Density:
1.98 - 2.13, Average = 2.05
Diaphaniety:
Transparent
Habits:
Globular - Spherical, or nearly so, rounded forms (e.g. wavellite)., ,
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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