EAS201 Study Guide - Midterm Guide: Ignimbrite, Boron, Mount Batur
20 Sep 2016
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Clear color shows there is no ionic substitution. Amethyst, same mineral as quartz but is purple. Hot pink color = fake colors, have been dyed. Looks clear when you get it out of the ground. Glass definition: an amorphous substance solid made in nature. Ruby (red) due to ti, fe, or both. Color variety in minerals is largely but not exclusively due to ionic substitution. Neither faces nor cleavage planes, it"s how it"s cut. If a crystal is allowed to grow freely, it tends to have an outer shape that mimics the symmetry on the atomic scale. ***know if it"s a carbonate, or silicate, or oxide, or sulphide*** Acid test: when you put acid on a rock it can differentiate between calcite and dolomite. Sodium lithium boron silicate hydroxide (found in nature) Foliation = metamorphic [no foliation = not metamorphic] ______ = igneous ignimbrite volcanic bomb that was thrown out of a volcano splat".
