Color Index: ● Texture: ● ● Felsic (light) Intermediate (medium) Mafic (dark) · Phaneritic (coarse-grained) Aphanitic (fine-grained) Porphyritic (coarse-grained porphyroclasts in a fine-grained matrix) Glassy (no visible grains) Porous (visible holes/bubbles) Color Index Texture BIN 1 Rock ID Color Specific gravity Are the rocks in Bin 1 intrusive or extrusive? Proportions of light and dark minerals Volume percent of minerals 100 90- 80- 70- 60- 50 40 30 20 10 0 Sample 1A felsic 70 phaneritic Light colored Low specific gravity Felsic Orthoclase Quartz Muscovite 65 cm cm in cm Na-r Chapter 5 Sample 1A in S ←S Intermediate Biotite Plagioclase ←S Amphibole Chapter 5 Sample 1B StraboSpot Chapter 5 Sample 1C 60 55 Percent of silica by weight StraboSpot Sample 1B intermediate StraboSpot Phaneritic Mafic Pyroxene 50 Sample 1C mafic phaneritic Dark colored High specific gravity 45 Ultramafic Olivine 40

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