EESC1180 Study Guide - Final Guide: Roxbury Conglomerate, Igneous Rock, Labradorite
29 Nov 2017
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Know the physical properties used to identify a mineral. Basal or planar - breaks one way (mica) Density is the real term here, but for their purposes we call it light, int, or heavy - best of luck with this - it"s subjective. There"s more, but i don"t think they"ll be tested. Two main groups - metallic and nonmetallic. Resinous: sort of pitchy, tary, sticky weird kinda texture (not on original lab at all) Greasy: like oil on water, reflective (not on original lab) Know the mohs hardness scale and associated minerals. Effervescence: does it bubble when you hit it with the acid? (will have high calcium content if this is the case) Double refraction: split light into two waves. Labradorescence: shiny because it separates light - see plagioclase feldspar. Radioactivity: safe to say this shouldn"t be on the final. Olivine, pyroxene, hornblende, biotite, muscovite, quartz, alkali feldspar, and plagioclase feldspar. Minerals with highest silica contents usually > than 65%
