Lecture2 - The(Traditional)DefinitionofaMineral: 1. 2. 1....

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The (Traditional) Definition of a Mineral:  1. Solid 2. Naturally occurring 1. Inorganic 1. Fixed composition, or one that varies within limits 2. Has an ordered, repeating atomic structure: crystalline
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Quartz cluster from Peru
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Quartz scepter From Madagascar
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Magnetite from Africa
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Fluorite from New Orleans
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A single crystal is defined as a regular array of  atoms that is repeated with the same orientation  and without interruption throughout the sample.
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Nicholas Steno (1638-1686) 
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Crystals are distinguished by their flat faces and the  angles between them.  These two crystals look very  different, but they have the same faces. Difference faces  Fig. 3-1
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Constant Interfacial Angles The different crystal faces can be identified by the constant angles they  have with adjacent faces. Fig. 3-2
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R.J. Hauy (1743 - 1822) 
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Fig. 3-3 unit cell -the small block that is  repeated to make up  the crystal is the unit  cell
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Max Theodor  Felix von  Laue (1879 -1960) diffraction
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Fig. 3-4 Laue  photograph
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Fig. 3-4 Laue  photograph
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This note was uploaded on 07/07/2010 for the course GEO geo taught by Professor Long during the Spring '10 term at University of Texas at Austin.

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Lecture2 - The(Traditional)DefinitionofaMineral: 1. 2. 1....

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