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 . QUARTZ (after Barite) ENCRUSTING Near Silverton, Col. Bement Collection, American Museum of Natural History. QUARTZ (after Calcite) Zacatecas, Mexico Bement Collection, American Museum of Natural History DEFINITION OF TERMS 63 (Note: The teacher can enormously expand the foregoingparagraphs through examples, brought into the class-room, illus-trative of the numerous possible physical configurations of should be broken,
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 . QUARTZ (after Barite) ENCRUSTING Near Silverton, Col. Bement Collection, American Museum of Natural History. QUARTZ (after Calcite) Zacatecas, Mexico Bement Collection, American Museum of Natural History DEFINITION OF TERMS 63 (Note: The teacher can enormously expand the foregoingparagraphs through examples, brought into the class-room, illus-trative of the numerous possible physical configurations of should be broken, and their internal structure or texture,noted, amorphous masses opened and studied, while the concentricradiating lamellar scaly, granular construction of purely crystal-line bodies should be examined). PSEUDOMORPHISM. By Pseudomorphism is meant the substitution of one mineralfor another with the crystalline form of the second unchanged,Pseudomorphs arise in three different ways, (i) By encrustation,as when quartz coats calcite, concealing the covered mineral com-pletely though assuming the crystalline form of the calcite. Suchphases of pseudomorphism are called Epimorphs. (2) By thechemical alteration of a mineral, when, by losing a constituent orby gain of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
