| 31. | Most common rock-forming minerals are anisotropic, including quartz and feldspar.
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| 32. | Feldspar phenocrysts typically are labradorite to andesine in composition.
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| 33. | In some rocks the potash feldspar, in others the soda feldspar predominates.
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| 34. | In some rocks the potash feldspar, in others the soda feldspar predominates.
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| 35. | The sandstone is made up of quartz and feldspar.
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| 36. | Metavolcanic rock can contain the minerals quartz, feldspar, amphibole, pyroxene.
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| 37. | If sodic feldspar is the dominant phase, the result is an antiperthite.
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| 38. | Hey Feldspar, what is up your ass buddy?
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| 39. | It forms by hydrothermal alteration of primary feldspar minerals.
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| 40. | They are angular intergrowths of quartz and alkali feldspar.
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