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The angular relationship of a crystal faces to the crystal axes can be expressed in several ways. Miller indices is the most common method. Miller indices denote the reciprocal of the distance by which a crystal face intercepts the crystal axes the distances being measured in units proportional to the axial ratio. Three indices are given, one for each of the crystal axes, and they are always expressed as whole numbers or zero. There would be four indices for the hexagonal and trigonal system. In the field of optical mineralogy, it has been known that if the face is parallel to a crystal axis, it intercepts it at infinity, the reciprocal of which is zero. On the other hand, if a face intercepts the negative end of a crystal axis, a bar is placed over the number.



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Thursday, April 16th, 2009 at 2:31 am
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Optical Mineralogy
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