| 1. | Common examples of micas are muscovite, and the biotite series.
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| 2. | It also occurs in carbonatites and chlorite, biotite and phlogopite.
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| 3. | Around Mount Job, rhyodacite contains hornblende, biotite and quartz.
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| 4. | The biotite forms hexagonal " blocks, " up to across.
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| 5. | Phenocrysts in the postglacial rocks are biotite, plagioclase and quartz.
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| 6. | Biotite is annite, with high Fe / Mg ratio.
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| 7. | Biotite, cancrinite and sodalite are characteristic of this rock.
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| 8. | It contains also orthoclase, nepheline, biotite, aegirine, acmite.
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| 9. | The dark matrix consists of biotite, aegirine-augite and melanite.
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| 10. | Hornblende and biotite occur also, but are less common.
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