Earth Sciences 1022A/B Lecture Notes - Lecture 1: Mica, Pyroxene, Sphalerite
18 Oct 2015
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Chapter 2: amethyst, example of a mineral, some are considered gems etc. used for jewelry, mineralogy: study of minerals, minerals: solid chemical compound that is made/found by nature, can make chemical compounds identical to minerals but they are not natural, they contain molecules, vary in the elements in the way they are put together, atomic bonding: within the molecules, use them to tell them apart, physical properties eg. cleavage and hardness, mineral will crack along cleavage plains, 4000 natural minerals named after their discoverers, 20 common in earth"s crust (looking at lab) Silicates: abundant, tetrahedral bonded, silicon(1) oxygen(4) tetrahedron (tetra=4, hedron=pyramid, ^two elements on periodic table (here they are ions: element of excess or lack of electrons, ball and stick model, cations less elections(+charge) and anions extra electrons ( charge) and oxygen is larger, silicon is down by 4 elections = +4 charge.
