EOSC 114 Lecture Notes - Lecture 28: Kyanite, Ion, Anorthite
18 Jun 2016
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Module a: rocks, minerals, and gems: e. g. : rutile, calomel, zircon: hexagonal and trigonal, 3 crystallographic axes at 120 of equal lengths, trigonal (e. g. : calcite, quartz, tourmaline, hexagonal (e. g. : beryl, apatite, monoclinic, 3 crystallographic axes of unequal length, e. g. : borax, jadeite, malachite: orthorhombic, 3 crystallographic axes at right angle of unequal length, e. g. : olivine, topaz, barite: triclinic, 3 crystallographic axes at less than 90 of unequal length, least symmetrical shape, e. g. Recognize the ball and stick and polyhedral methods for constructing atomic models of crystals. Ball and stick: balls represent atoms, sticks represent chemical bonds. Helps interpret 3d structure of a mineral (polyhedra) Platonic solids: four most common shapes in minerals (tetrahedron, octahedron, cube, and icosahedron) Summarize the historical sources of diamond prior to 1867. Diamond originates from greek word adamao ( i tame ) First appreciation and mining of diamond was in india. Diamonds of euhedral shape (e. g. : octahedrons) were the most valued.
