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Unformatted text preview: rocks form from it ii. For (pretty much) all rocks, Silicate (SiO2) is the major components 1. Siliac (felsic) rocks – light colored a. Felsic rocks are high in silicates – 65% or more silicate by weight b. Low in metals 2. Mafic rocks (Magnesium-Iron –ic) – dark colored a. Low in silicate (about 50% in weight) b. Replaced in magnesium, iron and calcium 3. Ultramafic rock a. Superlow amounts of silicate (45% or lower) i. Basalt – fine-grained – mafic – extrusive ii. Granite – course-grained—felsic—intrusive iii. Rhyolite—fine-grained—felsic—extrusive iv. Gabbro—course-grained—mafic—intrusive IV. Igneous rock distribution a. Under land – felsic and light b. Under oceans/islands – mafic and heavy...
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This note was uploaded on 04/09/2008 for the course GEOL 1030 taught by Professor Abolins during the Fall '08 term at Middle Tennessee State University.
- Fall '08