. Carnegie Institution of Washington publication. 22 INFRA-RED TRANSMISSION SPECTRA. , , 6, , and /x, is due to Nichols,1 who used a section mm. thick. Unfortunately his curve begins in the slight band at 4-35 A1; so that there is no check upon its accuracy of location. Konigsberger2 examined smoky quartz and found bands at and /«,. Merritt,3 using polarized light, found bands at 3 and /t for the extraordinary ray, and bands at , , and p. for the ordi- nary ray. For amethyst, which is violet quartz, of which the color has been attributed to mangan
. Carnegie Institution of Washington publication. 22 INFRA-RED TRANSMISSION SPECTRA. , , 6, , and /x, is due to Nichols,1 who used a section mm. thick. Unfortunately his curve begins in the slight band at 4-35 A1; so that there is no check upon its accuracy of location. Konigsberger2 examined smoky quartz and found bands at and /«,. Merritt,3 using polarized light, found bands at 3 and /t for the extraordinary ray, and bands at , , and p. for the ordi- nary ray. For amethyst, which is violet quartz, of which the color has been attributed to manganese, Konigsberger found an absorption band at fi. As a whole, different observers agree in locating a small band near 3 p. which will not interfere in considering water of crystallization. 60%. 345 FIG. 6.—Heulandite. to /•*// Opal is quartz containing variable proportions of water, from 5 to 30 per cent. It shows no traces of crystallization. Neither is it considered a solid solution, for the water contained is not a function of the vapor pressure. The transmission curve of opal has the general outline of the curve for water and contains the bands of water at , 2, 3, and 6/u,, as well as the silicon bands at and 5 p. The 3 and 6 p. bands are the composite of the water and silicon bands in those regions. (Section ground parallel to b; f = and mm.; semi-transparent. Fig. 6.) Heulandite belongs to a class of minerals called zeolites,4 which are hydrated silicates of alumina, alkalies, and generally lime. To this class 1 Nichols : Phys. Rev., 4, p. 297, 1896. * Konigsberger : Ann. der Phys. (3), 61, p. 687, 1897. 'Merritt: Ann. der Phys. (3), 55- P- 49, 1895. 1 Miers : Mineralogy, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, C
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