General Information:
Chemical Formula:
NaMg6AlSi6Al2O22(OH)2
Composition:
(Molecular Weight = 804.28 gm)
Sodium 2.86 % Na
Magnesium 18.13 % Mg
Aluminum 10.06 % Al
Silicon 20.95 % Si
Hydrogen 0.25 % H
Oxygen 47.74 % O
Empirical Formula:
NaMg6Al(Si6Al2O22)(OH)2
IMA Status:
Approved IMA 1997
Name Origin:
Named for its composition and the original gederite location at Heas, Gedres, France.
Physical Properties:
Cleavage:
[???] Good
Color:
light brown.
Hardness:
5-6 - Between Apatite and Orthoclase
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