A popular guide to minerals : with chapters on the Bement Collection of minerals in the American Museum of Natural History, and the development of mineralogy (1912)
Gratacap, L. P. (Louis Pope), 1851-1917 · New York : D. Van Nostrand · leaf 105
seen. These axes are aptto be three. Some minerals, as epidote, show this property withsurprising beauty. RELATION OF CRYSTALS TO LIGHT. Reflection. When a ray of light strikes perpendicularly or atright angles upon any polished surface, as at a, b, (PI. 12, Fig. 255),it is thrown back in exactly… … ^ig- 259 Fig. 260 PLATE 12 again bent back, parallel to its original course, as is seen in thefigure. Double Refraction. Some substances possess the property ofsplitting the ray which passes through them, producing an effect DEFINITION OF TERMS 67 which is known as double refraction (PI. 12, Fig.…
American Museum of Natural History. Bement Collection of Minerals · Mineralogy
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