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53.5 Red crystalline chert. NE Diablo Range, California. White veins of crystalline quartz cut across this grainy, recrystallized chert layer. Black areas are manganese oxide minerals. [Scale is standard GSA scale with cm divisions.]
Image 111 of 156
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![53.5 Red crystalline chert. NE Diablo Range, California. White veins of crystalline quartz cut across this grainy, recrystallized chert layer. Black areas are manganese oxide minerals. [Scale is standard GSA scale with cm divisions.]](../53.5.JPG)