![6.0 Porphyritic leuco-granodiorite. Castle Crags, California. Gray glassy quartz forms square-appearing euhedral crystals, euhedral pink crystals are alkali feldspar, and white crystals are plagioclase feldspar. A weathered mafic phase appears as goethite or limonite fillings in small depressions. [Scale is standard GSA scale with cm divisions.]](../6.0.JPG)
6.0 Porphyritic leuco-granodiorite. Castle Crags, California. Gray glassy quartz forms square-appearing euhedral crystals, euhedral pink crystals are alkali feldspar, and white crystals are plagioclase feldspar. A weathered mafic phase appears as goethite or limonite fillings in small depressions. [Scale is standard GSA scale with cm divisions.]