The Synthesis of a Silicalcyanide and of a Felspar . he acidic felspar albite in various proportions. These transition mineralsare the important rock formers—labradorite, andesine, and oligoclase, withother minor varieties, which exhibit well known and gradual changes inchemical composition and in physical characters between the two extremes. Notwithstanding the wide difference in composition between anorthiteand albite, which becomes apparent when the simplest expression of thecomposition of each mineral is compared as under— Anorthite CaSi2Al208 Albite NaSi3A108 their known relations above m
The Synthesis of a Silicalcyanide and of a Felspar . he acidic felspar albite in various proportions. These transition mineralsare the important rock formers—labradorite, andesine, and oligoclase, withother minor varieties, which exhibit well known and gradual changes inchemical composition and in physical characters between the two extremes. Notwithstanding the wide difference in composition between anorthiteand albite, which becomes apparent when the simplest expression of thecomposition of each mineral is compared as under— Anorthite CaSi2Al208 Albite NaSi3A108 their known relations above mentioned indicate that there is some funda-mental similarity in constitution. If the unoxidised nuclei are consideredin view of the information gained in the earlier part of this work, it is easyto trace such a relationship. The simple silicaleyanide type underlyinganorthite is — SiAl; that of albite is obviously more complex, but stillincludes at least one such member, if the nucleus be represented by thefollowing constitutional formula :—. Ultimate oxidation of this to albite probably would not make any materialchange in the relations of the principal elements, and the constitution of thatmineral may similarly be represented as under—
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