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 . nt and observation. But chem-istry more and more inclosed the domain of mineralogy, and inthe extension of analyses, the discovery of more exact methodsof analysis, new species, were being constantly added, while at lasta norm of reference became estabHshed as to the relationship ofminerals, and so the modern chemical classifications slowly emerged. The modern movement in the widening and deepening studiesin mineralogy has gone on uncea
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 . nt and observation. But chem-istry more and more inclosed the domain of mineralogy, and inthe extension of analyses, the discovery of more exact methodsof analysis, new species, were being constantly added, while at lasta norm of reference became estabHshed as to the relationship ofminerals, and so the modern chemical classifications slowly emerged. The modern movement in the widening and deepening studiesin mineralogy has gone on unceasingly, and now in its crystal-lographic relations the treatises on symmetry have attacked theproblems of molecular form and position, and in its chemical as-pects began those speculations upon the evolution of mineralogicaltypes in which Tschermak and Clarke have offered distinguished as-sistance. Whereas in 1832 few minerals were in composition free from alldispute, now chemical formulae are exactly determined, and thegreat groups of the amphiboles, pyroxenes, scapolites, garnets,micas, feldspars, have been defined. The tendency has been to I 1 inch I. CYANITE Biirnsville, N. C. Bement Collection, American Museum of Natural History
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
