Brauns, R. (Reinhard), 1861-1937, Spencer, Leonard James, 1870- · Esslingen a. N. : J. F. Schreiber · leaf 242
lon showed the presence of ZrO-2 66*71% and SiOo 33*05 %. Coloured zircon contains in addition from % to 3 per cent, of iron oxide. Small amounts of thorium and other rare earths are also sometimes present. The crystalline form is tetragonal, and the crystals, which are frequently bounded by faces… … be very narrow or even quite absent, Fig. 17G. Fig. 175. and we have then the simple bipyra- Crystals of Zircon. mid (fig. 21). On other crystals the prism of the second order may be present, either as narrow faces (a in text-fig. 176) or as the predominating form (text- fig. 177 and figs. 20 and…
Mineralogy
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