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Crystallographic_Concepts_F10

Crystallographic_Concepts_F10 - Crystallographic Concepts...

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1 Crystallographic Concepts GLY 4200 Fall, 2010
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2 Atomic Arrangement Minerals must have a highly ordered atomic arrangement The crystal structure of quartz is an example
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3 Quartz Crystals The external appearance of the crystal may reflect its internal symmetry
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4 Quartz Blob Or the external appearance may show little or nothing of the internal structure
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5 Building Blocks A cube may be used to build a number of forms
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6 Fluorite Fluorite may appear as octahedron (upper photo) Fluorite may appear as a cube (lower photo), in this case modified by dodecahedral crystal faces
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7 Crystal Growth Ways in which a crystal can grow: Dehydration of a solution Growth from the molten state (magma or lava) Direct growth from the vapor state
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8 Unit Cell Simplest (smallest) parallel piped outlined by a lattice Lattice: a two or three (space lattice) dimensional array of points
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9 Lattice Requirements Environment about all lattice points must be identical Unit cell must fill all space, with no “holes”
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