Color Index Texture BIN 2 Rock ID re the rocks in Bin 2 intrusive or extrusive? Light colored Low specific gravity Color Specific gravity Proportions of light and dark minerals Volume percent of minerals 100 90 80- 70 60 50 40- 30 20 10 0 Sample 2A 70 Felsic Orthoclase Quartz Muscovite 65 Na-rich cm in 1 Intermediate Z Plagioclase Biotite Chapter 5 Sample 2A Amphibole Sample 2B 60 55 Percent of silica by weight 2 3 4 5 6 7 S StraboSpot p/kompoting facebook.com/Stabipop Mafic Pyroxene 50 Sample 2C Dark colored High specific gravity 45 Ultramafic Olivine 40

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