Browsing by Author "Frondel, Clifford, 1907-"
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Item Catalogue of mineral pseudomorphs in the American Museum of Natural History. Bulletin of the AMNH ; v. 67, article 9(New York : The American Museum of Natural History, 1935) Frondel, Clifford, 1907-Item Mineral incrustations upon the edges and corners of crystals. American Museum novitates ; no. 759(New York City : The American Museum of Natural History, 1934) Frondel, Clifford, 1907-"Instances are described of mineral incrustations confined to the edges or corners of the incrusted crystals. The effect is explained by the greater adsorptive power of these portions of the crystal surface. Adsorption by the edges and corners of growing crystals may be accompanied by a change in crystal habit, modifying faces being developed which suppress the adsorbing edge or corner"--P. [1].Item Origin of the segmental coloration of amethyst and smoky quartz. American Museum novitates ; no. 758(New York City : The American Museum of Natural History, 1934) Frondel, Clifford, 1907-Item Some instances of incrustations selective upon crystal forms. American Museum novitates ; no. 695(New York City : The American Museum of Natural History, 1934) Frondel, Clifford, 1907-Item Some mineral incrustations selective upon crystal forms. American Museum novitates ; no. 918(New York City : The American Museum of Natural History, 1937) Frondel, Clifford, 1907-Item Twisted crystals of pyrite and smoky quartz. American Museum novitates ; no. 829(New York City : The American Museum of Natural History, 1936) Frondel, Clifford, 1907-