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Which of the following is the black oxide of iron?

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in Construction & Building Materials by (190k points)
Which of the following is the black oxide of iron?

(a) Limonite

(b) Magnetite

(c) Siderite

(d) Pyrite

This question was addressed to me in exam.

My enquiry is from Ferrous Metals in portion Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

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Right option is (b) Magnetite

The best I can explain: Magnetite is the black oxide of iron. Magnetite is the richest iron ore and contains about 70-73 % of the iron in its pure state. It is available in Madras in India.

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