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Minerals - Minerals Chapter 3 Minerals Chapter 3 What are...

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Minerals Chapter 3 What are minerals? Minerals are • Solid Naturally occurring Limited chemical composition can have the same chemical composition, but be a different mineral.. crystal lattice-defined by the arrangement of the atoms and the bonds. Crystal System Lattices Crystal System Lattices triclinic rhombohedral monoclinic tetragonal orthorhombic cubic hexagonal Minerals Chapter 3 1
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regular atomic arrangement • crystals What are they made of? Minerals are made of • atoms different elements positive and negative teams joined in the crystal lattice How do atoms bond together to form crystals? First note atoms balance between protons and electrons Note shells of electrons First - 2 Second - 8 Third - 14 Unfilled shells means they “want to date” with another element to share electrons http://en.wikipedia.org/wiki/Electron_shells http://en.wikipedia.org/wiki/Crystals Minerals Chapter 3 2
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Atoms with unfilled shells Look for partners positive seek negative What kind of bonds for between atoms? Major kinds • Ionic • Covalent Minor kinds metallic bonding (gold) van der waals bond (graphite) How do ionic bonds form?
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