EOSC 114 Lecture Notes - Lecture 25: Formula Unit, Solid Solution, Chemical Formula
18 Jun 2016
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Extract information from a mineral formula, such as the component elements and number of atoms of each element. Chemical composition of a compound/mineral is represented by a chemical formula. 1 silicon, 2 oxygen atoms per formula unit. Describe the concept of charge neutrality in relation to minerals. All compounds, including all minerals, must be charge neutral. Charge neutral: every positive charge must be balanced by a negative charge. Distinguish between major, minor, and trace elements. Elemental constituents of a mineral can be divided based on relative abundance. Always reported in wt % of the oxide. Present in smaller amounts, commonly replace major elements. Usually reported in wt % of the oxide. Found in very small amounts, replacing major elements or occupying holes . Reported in ppm on an element weight basis or ppb on an atom basis.
