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 . , the coloris darker. Twinning in Sulphur is rare. The best crystals are found inmarl or clay along with calcite, gypsum, celestite, aragonite (them-selves, especially gypsum, frequently superbly developed) wherethe crystals seem to have been formed from hot waters. Girgenti,Sicily, has furnished admirable crystals. Sulphur is dimorphous,assuming monoclinic forms where fused and cooled. In Louisiana beds, deeply seated, of Sulphur, have
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 . , the coloris darker. Twinning in Sulphur is rare. The best crystals are found inmarl or clay along with calcite, gypsum, celestite, aragonite (them-selves, especially gypsum, frequently superbly developed) wherethe crystals seem to have been formed from hot waters. Girgenti,Sicily, has furnished admirable crystals. Sulphur is dimorphous,assuming monoclinic forms where fused and cooled. In Louisiana beds, deeply seated, of Sulphur, have been ex-tracted by a system of melting the buried sulphur, and pumpingit to the surface. In 1909 the sulphur product of the United Stateswas valued at $4,432,000. Graphite is, with the exception of the diamond, the purestform of carbon, and its impurities are largely mechanical admix-tures of iron or clay. It occurs in flakes, streaks, and nodules ormasses in metamorphic rocks, where it seems to have been developedby heat and distillation from vegetable remains. The mines atTiconderoga, N. Y., produced in 1890 about 400,000 pounds of re-fined CALCITE Cumberland, England Bement Collectien, American Museum of Natural History
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
