. Carnegie Institution of Washington publication. SULPHATES. 79 FERROUS SULPHATE (FeSC»4+7H2O). (Curve b, fig. 62.) This crystal dehydrated so rapidly that the surface became rough. There is one well-defined maximum at /* which is harmonic with the SO4 band at p. ALUM (K2S(XA12(SO4)8+24H2O). (Curve a, fig. 63.) Aschkinass (loc. cit.) found a small reflection band at ^. The present examination was made to compare it with that of other com- pounds having the SO4 radical. The maximum was found at /*.. 6 6 FIG. 63.—Alum (a); Anhydrite. IO 12/A ANHYDRITE (CaSO4). (Curve b, fig. 63.
. Carnegie Institution of Washington publication. SULPHATES. 79 FERROUS SULPHATE (FeSC»4+7H2O). (Curve b, fig. 62.) This crystal dehydrated so rapidly that the surface became rough. There is one well-defined maximum at /* which is harmonic with the SO4 band at p. ALUM (K2S(XA12(SO4)8+24H2O). (Curve a, fig. 63.) Aschkinass (loc. cit.) found a small reflection band at ^. The present examination was made to compare it with that of other com- pounds having the SO4 radical. The maximum was found at /*.. 6 6 FIG. 63.—Alum (a); Anhydrite. IO 12/A ANHYDRITE (CaSO4). (Curve b, fig. 63.) Cleavage pieces pasted upon cardboard to form an area sufficiently large for reflection. In comparison with selenite, it will be noticed that the large maximum of the latter is here found at ju, followed by a small band at p. It seems a little surprising that the latter band should be so small if it is a harmonic of the large band (of CaSO4) at 4-55 /*• DIASPORA AIO(OH). (Cleavage piece parallel to b. Curve a, fig. 64.) This is the most remarkable mineral yet examined. For the region up to 8 p. it has no marked absorption bands. Beyond this point condi- tions are entirely reversed. There is a broad reflection band extending. 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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