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zinc blende

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{n: thallium, Tl, atomic number 81} a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores

{n: zinc blende, blende, sphalerite} an ore that is the chief source of zinc; consists largely of zinc sulfide in crystalline form

{n: zinc, Zn, atomic number 30} a bluish-white lustrous metallic element; brittle at ordinary temperatures but malleable when heated; used in a wide variety of alloys and in galvanizing iron; it occurs as zinc sulphide in zinc blende

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