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| Two crystals that grow in a parallel fashion |
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| Growing a crystal layer of one mineral on the crystal base of another mineral in such a manner that its crystalline orientation is the same |
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| Two seperate crystals sharing some of the same crystal lattice points |
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| Crystal Composition Surface |
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| Surface along which lattice points are shared in twinned crystals |
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| Fluorite, Pyrite, Orthoclase |
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| between two different elements with different electronegativity |
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| atoms achieve a stable electron configuration by sharing one or more electrons, between the same ions or ions with similiar electronegativity |
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| Outer electrons are not bonded to any particular atom but can roam freely about |
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| Weak, some molecules have polar nature |
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| A bond formed by a hydrogen atom to an electron negative atom |
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| Anions are around Cations. The distance between the two is determined by sum of radii & C.N. by the Ra Rx |
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| An Ionic Structure will be stable as long as the electrostatic bonds between an anion and cation are equal to the charge on the anion |
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| When polyhedra share faces or edges they will be less stable |
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| In a crystal containing different cations, those of high valency and small coordination number tend not to share polyhedron elements with one another. |
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| The number of different types of consitituents in a crystal teends to be small because there are aonly a few types of contrastint cation and anion sites. |
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| all designed to maximize cation-anion attractions and to minimize anion-anion and cation-cation repulsion |
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Cubic Close Packing halite, gold, silver, platinum Radius Ratio is 1. Packed in Layers ABC ABC ABC |
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Hexagonal Closest Packing. Radius Ratio:1 Packed ABABAB |
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| Simple Cubic Packing: Ra: Rx Values .73-1.0 Cations at the center of a cube and the anions at the eight corners |
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