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Orthoclase Mineral Data
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General Orthoclase Information
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 Chemical Formula: |
KAlSi3O8 |
| Composition: |
Molecular Weight = 278.33 gm |
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Potassium 14.05 % K 16.92 % K2O |
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Aluminum 9.69 % Al 18.32 % Al2O3 |
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Silicon 30.27 % Si 64.76 % SiO2 |
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Oxygen 45.99 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
KAlSi3O8 |
| Environment: |
Intrusive and extrusive igneous, and metamorphic rocks. |
| IMA Status: |
Valid Species (Pre-IMA) 1823 |
| Locality: |
Common world wide occurrences. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek orthos - "right" and kalo -" I cleave" in allusion to the mineral's right angle of good cleavage. |
| Name Pronunciation: |
Orthoclase + Pronunciation  |
| Synonym: |
Adularia |
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Orthose |
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