Answer: aluminium
Notes: Corundum is a crystalline form of aluminium oxide typically containing traces of iron, titanium, vanadium and chromium.
- It is a rock-forming mineral.
- The main copper sulphide minerals are chalcopyrite, chalcocite, covellite, bornite, tetrahedrite and enargite.
- The most important ore mineral of silver is argentite (Ag2S, silver sulfide).
- The iron minerals that are at present used as ores are hematite, magnetite, limonite, and siderite
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