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glg101r2_appendix_g_rock_identification - Fine Porphyritic...

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Axia College Material Appendix G Igneous Rock Identification Full Name Derek Belton Date 11-16-2010 Examine the images of the five rocks. Identify as many characteristics as possible and enter the information in the table below. Based upon the observed characteristics, identify each specimen in the last column of the table. You may want to refer to Table 4.1 of Geoscience Laboratory (p. 81). Submit the completed Appendix in the Individual forum. Rock Specimen 1. 2. 3. 4.
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5. Rock Identification Specimen number Color Texture Recognizable Features Rock Name Light Intermediate Dark Very Dark Coarse
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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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