For an introductory college-level physical geology class: a review of how to classify and identify an igneous rock. Includes a discussion of the compositions ultramafic, mafic, intermediate, and felsic; and the textures phaneritic, aphanitic, glassy, frothy, pyroclastic; also reviews the naming process for porphyries and pegmatites, including identifying and naming the phenocrysts (and sorting out all these different terms!). Covers the following rocks: peridotite, gabbro, diorite, granite, basalt, andesite, rhyolite, obsidian, scoria, pumice, and volcanic tuff.
**This video comes near the middle of the semester, so there may be terms with which the audience is unfamiliar. For a full playlist, refer to the Geology playlists on the Earth Rocks! RU-vid Channel.
Content within this video is based on information available in any standard introductory college geology textbook (or lab manual), such as Essentials of Geology -- Tarbuck and Lutgens -- Pearson Publishing.
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25 июн 2014
