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 . CERUSITE (Twinned) Broken Hill Mine, New South Wales Bement Collection, :\meiican Museum of Natural History. PARISITE Muso Valley, New GranadaBement Collection, American Museum of Natural History GUIDE TO COLLECTIONS 151 trasted appearances, from dull earthy ag-gregates to brilliant sheen-covered mammillated masses like the specimens from Salisbury, Ct.,and Cleator Moor, Eng-. Frequently collections contain an in-structive series of exa
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 . CERUSITE (Twinned) Broken Hill Mine, New South Wales Bement Collection, :\meiican Museum of Natural History. PARISITE Muso Valley, New GranadaBement Collection, American Museum of Natural History GUIDE TO COLLECTIONS 151 trasted appearances, from dull earthy ag-gregates to brilliant sheen-covered mammillated masses like the specimens from Salisbury, Ct.,and Cleator Moor, Eng-. Frequently collections contain an in-structive series of examples of this species, which illustrate itswater origin. This is shown in the concretionary layers by whichits nodules and masses are built up, the irregular stems, spheresand stalactitic forms in which it occurs, and the localities whereit is being constantly accumulated, as in the mustard-seed bedsof Swedish lakes. Very excellent specimens, demonstrating itsgradual deposition are often exhibited in stalactites from silvermines; its branching form and the concentric sheaths of mineraldeposit, seen in cross section, are the self-evident indications of agradual release from solution of the oxydized ferrous salts. Thefibrous, terracotta films, with their blackis
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
