Abstract
Mineragraphy, the study of minerals in polished section with the metallographic microscope for the purpose of determining their identity and paragenesis, has generally been carried on under vertical illumination. Vertical illumination is commonly produced by reflecting a horizontal beam of light downward by means of a prism or mirror so that the light impinges on the mineral section at an angle of ninety degrees and is reflected back into the eye of the observer.
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