Geology Lab

Geology 101 Lab Mid-Term Study Guide: ❖ Mineral ▪ consentaneous ▪ Naturally Occuring ▪ Inorganic ▪ Homogenous ▪ decisive crystalline building ❖ Rock- aggregate of minerals I. NON-SILICATE MINERALS ❖ Properties of non-silicate minerals ▪ Luster (metallic or nonmetallic) ▪ callousness -Moh’s cruelness Scale 1.Talc 2.Gypsum 3.Calcite…. >2.5, scratched off by fingernail 5.5, two cleavages, dark green, short - Amphibole - >5.5 two cleavages, reflective, brownish-greenish-blackish, stretch crystals ❖ Feldspars- Sialic - lighter color - Quartz - Muscovite - Orthoclase (pink) - Plagioclase (white) Ferromagnesian - Olivene - Pyroxenes - Amphiboles - Biotite - Talc III.

IGNEOUS ROCKS ❖ Textures: -Vesicular - holes (pumice, basalt) -Glassy - Obsidian -Fragmental - welded ash (tuff) - Phaneritic - course- grained, plutonic (granite, diorite, gabbro, dunite) - Apanitic - fine-grained, volcanic (basalt, andesite, rhyolite) ❖ Compositions: % of ferromagnesium minerals -Ultramafic - 75-100, dunite -Mafic - 40-75, gabbro, basalt -Intermediate - 10-40, diorite, andesite -Felsic - 0-30, granite, rhyolite ❖ The rocks: - Gabbro - mafic, black&gray, shiny, plutonic, pha neritic - Diorite - intermed! iate, salt and pepper, plutonic, phaneritic - Granite - felsic, pink black and gray, pluntonic, phaneritic - Basalt - mafic, vesicular, black, volcanic, aphanitic - Andesite - intermediate, porphyritic, volcanic - Rhyolite - felsic, pink, volcanic, apanitic - Obsidian - glassy, volcanic, black - Pumice - vesicular, volcanic,...If you extremity to get a just essay, order it on our website: OrderEssay.net

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