. Carnegie Institution of Washington publication. WATER OF CONSTITUTION. 47 do not give coincident results, but there being no bands near those of water, it did not seem worth while to make further inquiry. CHLORITOID (H2(MgFe)Al2SiO7). (Variety, masonite; cleavage piece parallel to c; transmits blue-green; t = $- Curve b, fig. 33.) This mineral is very opaque to infra-red radiation. There are sev- eral small absorption bands, viz, at , , , 5, 6, and /*, as in the preceding. The point of interest is the absence of bands at and 3 /*.. / 234-567 6JU FIG. 33.—Pectolite(a); Chl
. Carnegie Institution of Washington publication. WATER OF CONSTITUTION. 47 do not give coincident results, but there being no bands near those of water, it did not seem worth while to make further inquiry. CHLORITOID (H2(MgFe)Al2SiO7). (Variety, masonite; cleavage piece parallel to c; transmits blue-green; t = $- Curve b, fig. 33.) This mineral is very opaque to infra-red radiation. There are sev- eral small absorption bands, viz, at , , , 5, 6, and /*, as in the preceding. The point of interest is the absence of bands at and 3 /*.. / 234-567 6JU FIG. 33.—Pectolite(a); Chloritoid CUNOCHLORE (HsMgsAlaSiaOis) J PfiNINlTS (HsMgFe)6Al2Si8Oi»). (Clinochlore: t = Peninite: curve b, t = o mm. Fig. 34.) These two minerals belong to the chlorite group, which is related to the micas, to be noticed presently. These minerals contain about 12 per cent of water, which is given off at a high temperature. Their transmission curves are unusually similar to those of the micas. There are absorption bands at , , , , and ^. The frequently recurring bands at and p, with the metallic reflection band at and fi, remind one of harmonic series. It may be that these bands belong to a slowly conveying spectral series, if not a harmonic series, for the first band oscillates between the values and /*, while the next band shifts from to /A, as will be noticed in the micas. As already mentioned, the constitution of many minerals is still doubt- ful. Clinochlore is one of these. From investigations made by Clarke and Schneider, it was inferred that the hydroxyl groups MgOH and. 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, Carnegie Institution of Washington
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