GLY 2010C Lecture Notes - Lecture 12: Silicate Minerals, Oceanic Crust, Plagioclase
Document Summary
Clastic non-carbonate sedimentary rocks that are almost exclusively silica-bearing either as forms of quarts or other silicate minerals. A number stating the ratio of the weight of a substance to the weight of an equal volume of pure h2o. Color of a powdered mineral, that appears when rubbed across a porcelain streak plate. The overall appearance that a rock has because of the size, shape, and arrangement of its constituent particles. A chemical element present only in minute amounts in a particular sample or environment. A distinct sheetlike body of crystallized minerals within a rock. The chemical alteration and mechanical breakdown of rock material during exposure to air, moisture and organic matter. Fine-grained, generally dark colored, igneous volcanic rock with more silica than basalt. A dark, fine-grained, extrusive (volcanic) igneous rock with a low silica content (40% to 50%), but rich in iron, magnesium and calcium. Generally occurs in lava flows, but also as dikes.
