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 . te is a rare and very delicate species and itsgrouped, tufted, tabular crystals on galenite and with pyrargyrite,are frequently seen, but are expensive mineral features. Tetrahedrite, the sulph-antimonide of copper, with a varyingadmixture of silver, iron, mercury, zinc, and lead, is so-calledfrom its assumption of the tetrahedral form, which makes it socharacteristic and distinct a mineral. Beautiful examples are oftenexhibited, many o
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 . te is a rare and very delicate species and itsgrouped, tufted, tabular crystals on galenite and with pyrargyrite,are frequently seen, but are expensive mineral features. Tetrahedrite, the sulph-antimonide of copper, with a varyingadmixture of silver, iron, mercury, zinc, and lead, is so-calledfrom its assumption of the tetrahedral form, which makes it socharacteristic and distinct a mineral. Beautiful examples are oftenexhibited, many of which have their surfaces altered into chalco-pyrite, in association with quartz from Kapnik, Hungary, and Corn-wall, England. Owing to its variable composition, its number ofalterations is large, extending to chalcopyrite, malachite, azurite,amalgam, bournonite, erythrite, cinnabar, and covellite. Its varia-ble composition arises from the replacement of copper by mercury,silver, iron, zinc. Tennantite, very near tetrahedrite, is darker andapt to be cubic or dodecahedral. Freibergite is an argentiferoustetrahedrite, and Schwatzite a mercurial CALCITE CVER COPPER Hancock, Houghton Co., Mich. Bement Collection, American Museum of Natural History
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
