Crystii - 1 Crystallography II Some Common Crystal Classes...

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Unformatted text preview: 1 Crystallography II Some Common Crystal Classes (Point Groups) I- Distribution of minerals among the different crystal systems: 1- 26% cubic, 21% monoclinic, 20% Orthorhombic. 2- Within each system, the holohedral class (normal class, or one with the highest symmetry elements) is the most commonly encountered. II- Abbreviated Hermann Mauguin Symbols: (Table 1). Note the differences between the long form and the short form. III- Forms within each class: 1- In each class, there is a form the faces of which intersect all of the crystallographic axes. This is known as the “general form”, and designated by {hkl} or {hk i l}. 2- The general form of a specific crystal class has the most # of faces among all forms in the same class. 3- All forms other than the general form are considered “special forms”. 4- The total # of possible forms is 48, 32 of which are “general”, the rest “special”. 5- The name of a crystal class is the same as that given to its general form....
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This note was uploaded on 02/27/2012 for the course GLY 314 taught by Professor Staff during the Spring '09 term at Marshall.

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Crystii - 1 Crystallography II Some Common Crystal Classes...

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