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Unformatted text preview: Fine Porphyritic Glassy Vesicular Pyroclastic x x x x x Light colored feldspar floating in sea of black fine textured matrix Porphyritic basalt 1. X X X X Light gray and dark gray feldspars, black ferromagnesian minerals Diorite 2. X X X X Basalt 3. X X X X Pink feldspars, glassy transparent quartz, black ferromagnesian minerals Gramite 4. X X X X Red to black wispy fabrics; dense glass; conchoidal fracture; sharp edges Obsidian 5. X X X X White to light gray; frothy glass; microscopic pores (vesicles) impart a light weight Pumice...
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This note was uploaded on 01/30/2011 for the course GLG 101 taught by Professor Brewer during the Fall '10 term at University of Phoenix.
- Fall '10