| 1. | In the alkali feldspar almost pure albite domains are observed.
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| 2. | Less quartz content would lead to " quartz alkali feldspar syenite ".
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| 3. | They are angular intergrowths of quartz and alkali feldspar.
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| 4. | Minerals in the tonalite are quartz, plagioclase, alkali feldspar and hornblende.
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| 5. | Alkali feldspar may be present in minor amounts.
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| 6. | The alkali feldspar is confined to the groundmass.
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| 7. | Alkali feldspar dominates, commonly represented by orthoclase and the exsolved lamellar albite, form perthite.
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| 8. | Dark rounded alkali feldspars, typically one centimeter or less in diameter, dominate this rock.
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| 9. | If the rock has a greater percentage of alkali feldspar, it grades into a syenite.
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| 10. | More than 90 % of the total feldspar content is in the form of alkali feldspar.
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