| 1. | Oligoclase is a high sodium feldspar crystallizing in the triclinic system.
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| 2. | The distinctive texture of rapakivi granite is due to oligoclase rims on orthoclase phenocrysts.
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| 3. | The accessory minerals of these rocks are principally oligoclase, muscovite, apatite and zircon.
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| 4. | Oligoclase is also found in metamorphic rocks formed under transitional greenschist to amphibolite facies conditions.
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| 5. | The feldspar is usually orthoclase, but can also be albite, oligoclase or microcline.
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| 6. | The main feldspar in mugearite is oligoclase.
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| 7. | Its reddish mass includes large crystals of potassium feldspar surrounded by green rings of oligoclase.
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| 8. | "' Oligoclase "'is a rock-forming mineral belonging to the plagioclase feldspars.
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| 9. | The feldspar ranges from bytownite to oligoclase, being usually a variety of labradorite; orthoclase is scarce.
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| 10. | The feldspar of the granulites is mostly orthoclase or cryptoperthite; microcline, oligoclase and albite are also common.
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