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61.3.1 Quartz-biotite schist. Lake Alpine area, Highway 4, California. Quartz is white and biotite is black. Compare with photo of different orientation in 61.3.2 . [Scale is standard GSA scale with mm diameter dots.]
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![61.3.1 Quartz-biotite schist. Lake Alpine area, Highway 4, California. Quartz is white and biotite is black. Compare with photo of different orientation in 61.3.2 . [Scale is standard GSA scale with mm diameter dots.]](../61.3.1.JPG)