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 . ORTHOCLASE (Adularia) Gaveradi and Tavetsch, Switz. Bement Collection, American Museum of Natural History. PYROXENE Nordmark, SwedenBement Collection, American Museum of Natural History # GUIDE TO COLLECTIONS 179 which, are often exquisitely terminated by crystal faces, whilegreen prehnite adds to their beauty, as a frequent associate. Theseare generally from Bergen Hill, N. J. or from Paterson, and aresometimes of large dimensions, whi
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 . ORTHOCLASE (Adularia) Gaveradi and Tavetsch, Switz. Bement Collection, American Museum of Natural History. PYROXENE Nordmark, SwedenBement Collection, American Museum of Natural History # GUIDE TO COLLECTIONS 179 which, are often exquisitely terminated by crystal faces, whilegreen prehnite adds to their beauty, as a frequent associate. Theseare generally from Bergen Hill, N. J. or from Paterson, and aresometimes of large dimensions, while alteration superveningbreaks them into softer aggregates, and changes the snowy whitesurface to a dull gray. Massive pectolite from California andMichigan are of interest. Okenite, pale yellow,or white in a acicular matted balls, fromGreenland and Iceland, laiimontite, in white frail spires of obliquecrystals, which quickly crumble upon loss of water, dioptase deriv-ing its name from *I see through, in allusion to an interior shineit has, in green hexagonal prisms ended with rhombohedrons, leadthis section. Dioptase only loses water at a red heat. It is foundin Siberia, and also, in the same habit, in the French Congo districtin Africa. Chrysocolla an amo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
