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 . CHABAZITE (Phacolite) Melbourne, Australia Bement Collection, x^merican Museum of Natural History. ANALCITE (with Apophyllite) Keweenaw Co., Mich. Bement Collection, American Museum of Natural Histcf DEVELOPMENT OF MINERALOGY 259 end, and the pure molecule of anorthite at the other. These in-vestigators prepared artificially the albite salt, and the anorthitesalt, and they made intermediary mixtures in which from anorthiteto albite the
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 . CHABAZITE (Phacolite) Melbourne, Australia Bement Collection, x^merican Museum of Natural History. ANALCITE (with Apophyllite) Keweenaw Co., Mich. Bement Collection, American Museum of Natural Histcf DEVELOPMENT OF MINERALOGY 259 end, and the pure molecule of anorthite at the other. These in-vestigators prepared artificially the albite salt, and the anorthitesalt, and they made intermediary mixtures in which from anorthiteto albite the percentage of the lime molecule gradually diminishedand that of the albite increased, as An 100; Ab^ Aug; Ab^ Aug; AbAn-i; AbgAui; AbgAn^; Ab 100. The conclusion of prime import-ance, associated with a variety of most useful detailed observations,was that *if the melting point were plotted in a system, of whichthey form the ordinates, while the percentage composition of thedifferent feldspars form the abscissas, we discover, within the limitsof accuracy of possible measurement at these temperatures, a nearlylinear relation: the melting point varies very closely with the com-position. We have no maximum, no minimum, no branching of thecurve, but from
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
