GEOL 1601 : Final Review
Document Summary
Lab 2: mineral identification: rock-forming minerals, feldspars- as a group, the feldspars are by far the most abundant minerals in the. Hardness of 6 and vitreous luster: quartz- one of the most abundant in the crust of the earth and is common in soils, rocks and even spheric dust. Hardness of 7, conchoidal fracture, and vitreous to somewhat greasy luster, but color varies: amphiboles- hornblende is the most common amphibole. Two direction cleavage with splintery look: pyroxenes- like the amphiboles, most pyroxenes occur as small, crystalline components of rock, especially certain igneous rocks. The most common pyroxene is augite, a greenish black to black mineral: mica- the two most frequently encountered micas, biotite and muscovite, are both common constituents of igneous and metamorphic rocks. Clays are recognized by their extremely small crystal size, dull luster, softness, and earthly odor: olivine- olive green to yellow green, vitreous to dull luster.
