GEO 303 Chapter Notes - Chapter 1: Calcite, Sulfur, Hematite
24 Dec 2017
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Has an ordered arrangement of atoms. These four criteria cause each type of mineral to have its own unique properties. more . Sedimentary: forms from sediments or chemicals deposited at earth surface or by water. Metamorphic: recrystallizes at high temperature and pressure. Miscellaneous properties: magnetism, salty taste, reactivity with hcl, rotten egg smell, unusually high or low density, greasy feel. Colorless describes a transparent mineral with no color (some halite, calcite) Pearly (sample 12) - looks like mother-of-pearl. Silky (sample 14) resulting from parallel fibers. Earthy (sample 1, 7) - dull, little or no reflection. Measure of the resistance of a mineral to scratching (not breakage) Mohs hardness scale (softest = 1, hardest = 10) Harder minerals and test tools will scratch softer ones. If you see only 1 set of parallel planes. If you see only 2 sets of parallel planes, you must give the intersection angle of the two.
