####3. Which one of the following is a mineral of iron?
[2012]
(a) Malachite
(b) Cassiterite
(c) Pyrolusite
(d) Magnetite
$[CuCO_3 Cu(OH)_2.$ - Malachite]
[Pyrolusite- $MnO_2$ ] [Cassiterite $-SnO_2$ ].
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