Week5IgneousRockChart-1

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Fullerton College *

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100

Subject

Geology

Date

Oct 30, 2023

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pdf

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Uploaded by eyeaye

Igneous Rock Name Picture of Rock Texture Minerals Present % Mafic Color Index Other properties/Uses Granite Porphyritic 20-60% quartz, 10-65% feldspar, 5-15% micas 0-15% Building materials Diorite Phaneritic 5% quartz, 10% alkali feldspar 15-45% Building materials Gabbro Phaneritic Calcium plagioclase, Pyroxene 45-85% Kitchen counter tops, cemetery markers, floor tiles Andesite Aphanitic to porphyritic Less than 20% quartz, 10% feldspathoid, 65% feldspar 15-45% Road and railway construction, fill gravel Rhyolite Aphanitic to porphyritic Quartz, K- feldspar, biotite 0-15% Building stone, construction aggregate, cutting tool Basalt Porphyritic Calcium plagioclase, pyroxene 45-85% Structural building materials such as bricks tiles Scoria Vesicular Basalt Aphanitic and vesicular 50 % silica, 10% calcium oxide 45-85% landscaping and drainage works. It is also commonly used in gas barbecue grills.

Igneous Rock Name Picture of Rock Texture Minerals Present % Mafic Color Index Other properties/Uses Peridotite Phaneritic 10 % olivine, 10% feldspar 85-100% As a source of valuable ores and minerals, including chromite, platinum, nickel and precious garnet Volcanic Tuff Pyroclastic Predominantly Glass 0-85% building material Volcanic Breccia Clastic Quartz, feldspar, lithics 0-85 % mainly used to make sculptures, gems, and architectural elements Porphyritic Andesite Aphanitic to porphyritic Plagioclase feldspar and amphibole 15-45% Used as aggregate and fill Obsidian Glassy 70 % or more silicon dioxide, granite, and rhyolite 0-85% Knives, gemstones, ornamental purposes Pumice Vesicular Feldspar , augite , hornblende, zircon 0-45% abrasive, especially in polishes, pencil erasers, and the production of stone- washed jeans

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