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grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons atomic number 72 , hafnium , Hf
mineral consisting of zirconium oxide baddeleyite
common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent zircon , zirconium silicate
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