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8.0 Syenite. Locality unknown. White to greenish-brown and grayish brown alkali feldspars are associated with minor black biotite mica. Sample courtesy of Sonoma State University Geology Department. [Standard cm scale provided.]
Image 19 of 156
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![8.0 Syenite. Locality unknown. White to greenish-brown and grayish brown alkali feldspars are associated with minor black biotite mica. Sample courtesy of Sonoma State University Geology Department. [Standard cm scale provided.]](../8.0.JPG)