| 1. | These include, spodumene, microcline, beryl, and tourmaline.
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| 2. | The origin of the microcline in shear zones poses another problem.
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| 3. | Amazon stone, or amazonite, is a green variety of microcline.
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| 4. | Fresh clear microcline is very characteristic of some types of nepheline syenite.
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| 5. | It is associated with microcline and astrophyllite at Pikes Peak, Colorado.
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| 6. | Sanidine is stable at the highest temperatures, and microcline at the lowest.
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| 7. | It is essentially a microcline, sodalite and cancrinite variety of nepheline syenite.
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| 8. | It contains microcline, and few feldspar phenocrysts.
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| 9. | Typically the host grain is orthoclase or microcline, and the lamellae are albite.
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| 10. | However, microcline is commonly poikilitic, with abundant fine-grained plagioclase and quartz.
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