EESA06H3 Chapter 5: Chapter 5.docx

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12 Apr 2012
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Heat, pressure, oxygen, available atoms, acid content play a role in determining minerals form. Mineral properties colour, lustre, hardness, chemical composition, the transmission of light under a microscope. Each type of mineral has its own orderly internal (crystalline) structure at the atomic level. Crystals perfectly formed minerals mineral specimens whose surfaces consist of faces, edges, and corners that show beautiful geometrical symmetry. 230 different kinds of symmetrical atomic arrangements possible in nature and each mineral type exhibits one or several of these 230 arrangements. Crystalline substance is one in which the atoms are arranged in a three dimensional, regularly repeating, orderly pattern. (universal internal property) Minerals a family of naturally occurring, crystalline substances that are physically and chemically distinctive. They are building blocks of rock, compositionally inorganic (no carbon- hydrogen molecules) Quartz made up of oxygen and silicon atoms sio2. Atoms the smallest, electrically neutral assemblies of energy and matter that we know exist in the universe.

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