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Oligoclase Mineral Data
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General Oligoclase Information
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 Chemical Formula: |
(Na,Ca)(Si,Al)4O8 |
| Composition: |
Molecular Weight = 265.42 gm |
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Sodium 6.93 % Na 9.34 % Na2O |
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Calcium 3.02 % Ca 4.23 % CaO |
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Aluminum 12.20 % Al 23.05 % Al2O3 |
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Silicon 29.63 % Si 63.38 % SiO2 |
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Oxygen 48.22 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.8Ca0.2Al1.2Si2.8O8 |
| Environment: |
Magmatic and pegmatitic rocks. |
| IMA Status: |
Valid Species (Pre-IMA) 1826 |
| Locality: |
Twedestrand, Norway. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek, oligos and kasein, "little cleavage." |
| Name Pronunciation: |
Oligoclase + Pronunciation  |
| Synonym: |
Ab80 |
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An20 |
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Sunstone |
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