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sept 3 - GLG 101 September 3 2010 Minerals geologic...

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GLG 101, September 3, 2010 Minerals – geologic definition of a mineral is specializes as naturally occurring, solid, definite chemical composition, ordered atomic arrangement, and mostly inorganic. A mineraloid exhibits some of these properties Rocks – made from minerals. Most rocks contain more than one kind of mineral. (Ex. Granite (k-feldspar – pink, quartz – grey, hornblende – black) Some are monomineralic (limestone (calcite), rock salt (halite)) Crystalline Structure – atoms in a mineral are specifically ordered. A solid with disordered atoms is called a glass. Crystalline structure is based on atomic patterns. Crystals – are rare minerals displaying flat external faces. Crystal faces form best in open cavities. Crystals are often prized mineral specimens. Constancy of interfacial angles: different samples of the same mineral will have the same crystal faces. Adjacent faces are always oriented at the same angle.
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