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 . cimens. Zeolites are typically hydrous minerals. They lose their waterupon exposure, or when in dessicators with sulphuric acid, andwith the loss they lose translucency and become opaque. This wateris recovered in a damp atmosphere and their translucency returns,as if, to quote Miers, the crystal edifice is not destroyed whenthe water is removed, and that the water can re-enter the meshesof the structure. Twinning is very prevalent in t
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 . cimens. Zeolites are typically hydrous minerals. They lose their waterupon exposure, or when in dessicators with sulphuric acid, andwith the loss they lose translucency and become opaque. This wateris recovered in a damp atmosphere and their translucency returns,as if, to quote Miers, the crystal edifice is not destroyed whenthe water is removed, and that the water can re-enter the meshesof the structure. Twinning is very prevalent in the zeolites, lossof water changes their optical behavior, and they are uniaxial orbiaxial in the same species (chabazite), and isomorphous mixturesare suggested. In the newer arrangement of the mineral groups, pectolite, cata-pleiite, calamine, dioptase, prehnite, thorite, tritomite, cerite, car-pholite, are placed with the anhydrous class, though all, exceptingtritomite and dioptase, have water constituents separable in a closedtube. Pectolite, in sheeny, glistening radiating spheres whichin cross sections show blended fan-shaped groups of needles, and. ORTHOCLASE (Adularia) Gaveradi and Tavetsch, Switz. Bement Collection, American Museum of Natural History
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
