Chemical Formula:
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(K,Na)(Fe+++,Al,Mg)2(Si,Al)4O10(OH)2 |
Composition:
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Molecular Weight = 426.93 g |
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Hydrogen |
0.47 % |
H |
4.22 % |
H2O |
0.00 % |
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Oxygen |
44.97 % |
O |
0.00 % |
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0.00 % |
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Sodium |
0.27 % |
Na |
0.36 % |
Na2O |
0.00 % |
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Magnesium |
2.28 % |
Mg |
3.78 % |
MgO |
0.00 % |
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Aluminum |
1.90 % |
Al |
3.58 % |
Al2O3 |
0.00 % |
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Silicon |
25.00 % |
Si |
53.48 % |
SiO2 |
0.00 % |
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Potassium |
5.49 % |
K |
6.62 % |
K2O |
0.00 % |
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Iron |
19.62 % |
Fe |
3.37 % |
FeO |
24.31 % |
Fe2O3
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100.00 % |
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75.41 % |
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24.31 % |
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Empirical Formula:
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K0.6Na0.05Fe3+1.3Mg0.4Fe2+0.2Al0.3Si3.8O10 (OH)2 |
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Environment:
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Altered from detrital biotite by marine diagenesis in shallow water under reducing conditions; especially in sandstone |
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Locality:
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Otago Peninsula, New Zealand. Common world wide.. Link to
MinDat.org
Location Data.
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Name Origin:
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From the Greek "glaucos" for the blue green color |
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Synonym:
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