Rock_Identification_9 - Table 2.1 Igneous rock...

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Table 2.1 Igneous rock identification key. Color, with associated mineral composition, is shown along the top axis. Each rock in a column has the color and composition indicated at the top of the column. Texture is shown along the left side of the key. Each rock in a row has the texture indicated for that row. To determine the name of a rock, intersect the appropriate column (color & mineral composition) with the appropriate row (texture) and read the name at the place of intersection. IGNEOUS ROCK IDENTIFICATION KEY 15% 45% 1 Also called phaneritic. Crystals generally 1-10 mm (1 cm}. The term pegmatite is added to the rock name when crystals are greater than 1 cm; e.g. granite-pegmatite. 2 Also called aphan/tic. Crystals generally less than 1 mm. 3 For example, a granite with phenocrysts is called porphyritic granite. 4 Basalt with a cinder-like appearance that develops from gas bubbles trapped in cooling lava (a texture referred to as vesicular] is called scoria. Sedimentary
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This note was uploaded on 04/03/2011 for the course PHYS 114 taught by Professor Comptonw during the Summer '10 term at Purdue University-West Lafayette.

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Rock_Identification_9 - Table 2.1 Igneous rock...

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