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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The extraordinary ray of mineral calcite has lower index of refraction than it ordinary ray. But in some other minerals, the extraordinary ray may possibly have higher index. This property is most often used as bases for defining the optic sign of the mineral. If the index of the extraordinary ray is greater than index of the ordinary ray, then the mineral is optically positive uniaxial mineral. However, if the index of extraordinary ray is less than the index of the ordinary ray, then it is considered as an optically negative mineral.

            The index of the extraordinary ray is considered variable. And the maximum or minimum index of the extraordinary ray is referred to as simply the index of extraordinary ray. The recorded index value in mineral identification is this index of extraordinary ray. The prime index of extraordinary ray is the index found between the index of the ordinary ray and the index of the extraordinary ray.



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Monday, March 24th, 2008 at 4:22 am
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Optical Mineralogy
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Click Here For Best Selection Of High Quality Polarizing Microscope