| 1. | The main minerals are quartz, perthitic orthoclase, and plagioclase.
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| 2. | A greater amount of plagioclase would designate the rock as tonalite.
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| 3. | At greater depth plagioclase is unstable and is replaced by spinel.
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| 4. | Myrmekite is a globular or bulbous symplectite of quartz in plagioclase.
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| 5. | Microprobe analysis showed that the plagioclase was very calcium-rich.
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| 6. | Phenocrysts in the postglacial rocks are biotite, plagioclase and quartz.
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| 7. | In the example of plagioclase, there are three cases of substitution.
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| 8. | It can be found in igneous rocks containing potassium feldspar and plagioclase.
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| 9. | The mineral assemblage is typically dominated by plagioclase plus pyroxene or hornblende.
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| 10. | It is black with phenocrysts of plagioclase in a medium grained lamination.
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