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Composition of major hafniumbearing zirconium
6 other sections not shown
alluvial sands altered varieties amounts of quartz amounts of rutile baddeleyite beach sands black sands Boise County byproduct cassiterite catapleiite cerium chromite CM CM CM CM r-l coast columbite contained essentially zircon County epidote essentially of zircon feldspar ferromagnesian minerals garnet given in table hafnium hafnium content hafnium-zirconium ratios Henderson County Hf/Zr high-hafnium Idaho ilmenite leucoxene limonite magnetite material mixed silicate-oxide monazite Nigeria oxide and mixed pegmatites percent zircon placer zircon produced quartz r-l cfl r-l CM r-l r-l r-l results are given rl 4J rl rl O rl rl rl rl rutile Sample consisted essentially Sample contained essentially sands occur scheelite sericite small amounts sphene thorium trace amounts Umgababa Union of South uranium varieties of zircon yttrium zircon Zircon concentrate Zircon occurs Zircon-bearing sands Zircon-sand concentrate zirconium minerals zirconium oxide zirconium-hafnium