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 . uster possessed by its representatives, we find the genus Hyaliisdivided as follows: H. bicolor lolite. H. acutus Axinite. H. rhombohedrus Quartz. H. opalinus Opal. H. vulcani Obsidian. H. sphserulus Sphserulite. H. ferriferus Isopyre. There was thus produced here a mixture of oxides, sub anduni silicates at the dictation of an extraneous fact, viz., luster;which, however correlated to density or molecular state, failed toexpress the es
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 . uster possessed by its representatives, we find the genus Hyaliisdivided as follows: H. bicolor lolite. H. acutus Axinite. H. rhombohedrus Quartz. H. opalinus Opal. H. vulcani Obsidian. H. sphserulus Sphserulite. H. ferriferus Isopyre. There was thus produced here a mixture of oxides, sub anduni silicates at the dictation of an extraneous fact, viz., luster;which, however correlated to density or molecular state, failed toexpress the esoteric principle which, in the philosophy of nature, es-tablishes a truly natural classification in minerals. That esotericprinciple was chemical make-up, which to-day rules the science andhas shed such an abundant light over its dark places as to enlist itamong the most finished and most rational sciences of our composition has been found to be the co-ordinating prin-ciple which enters most profoundly into all the varied aspects ofminerals and binds into certain necessary sequences crystalline form,hardness, luster, and optical DEVELOPMENT OF MINERALOGY 255 The third class of Dana under this system was the Hypogoea,or those so-called buried minerals. In this there were two orders,Pittinea and Anthracinca. Under the first were gums, bitumens,resins, and under the latter coal and graphite. The recent large ex-tension of the hydrocarbons could not have enjoyed its presentcomparatively intelligent arrangement if a system of color, trans-lucency, etc., as here adopted, had been retained. Among theseorganic products, as among the inorganic species, chemistry wasalone able to disperse the confusion of discrepant groupings andgive to the mineralogist the guidance of her dictum as to theirgenealogy and kinship. The affinities of chemical composition was the Ariadne threadwhich led the mineralogist through the Daedalian labyrinth of min-eral species, or perhaps
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
