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63.1 Magnetite-quartz-feldspar gneiss. Llano County, Texas. Dark bands are magnetite-rich, whereas light bands are alkali feldspar- (white) and quartz- (gray) rich. Yellow limonite stains some grain surfaces. [Scale shows cm divisions.]
Image 138 of 156
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![63.1 Magnetite-quartz-feldspar gneiss. Llano County, Texas. Dark bands are magnetite-rich, whereas light bands are alkali feldspar- (white) and quartz- (gray) rich. Yellow limonite stains some grain surfaces. [Scale shows cm divisions.]](../63.1.JPG)