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 . Fig. 370 PIRATE 21 Fig- 371 lyo A POPULAR GUIDE TO MINERALS Oligoclase is the mother species of the variety Sunstone,whose fiery reflections are highly prized. Excellent examples areshown in specimens from Norway. The brilliant schillerizationis supposed to arise from numerous included crystals or grainsof hematite or gothite. The peculiar glassy oligoclase from Mit-chell Co., N. C, is worthy of notice from its eccentric w
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 . Fig. 370 PIRATE 21 Fig- 371 lyo A POPULAR GUIDE TO MINERALS Oligoclase is the mother species of the variety Sunstone,whose fiery reflections are highly prized. Excellent examples areshown in specimens from Norway. The brilliant schillerizationis supposed to arise from numerous included crystals or grainsof hematite or gothite. The peculiar glassy oligoclase from Mit-chell Co., N. C, is worthy of notice from its eccentric was naturally regarded as beryl by good collectors until its realnature was detected by G. F. Kunz. Albite is often represented by the very beautiful examplesfrom Switzerland and the Tyrol, the cleavable masses from Gro-ton, N. H., and the large crystals from Amelia Court House, in the species is repeatedly shown and the elongatedcrystals called pericline are shown in the specimens from the Tyrol. Orthoclase is always extendedly illustrated, and the threetypes of twinning are fully exemplified; the Baveno twin (, 370) from Baveno, Ita
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
