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Which of the following imparts greenish grey colour to cement?

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Which of the following imparts greenish grey colour to cement?

(a) Calcium silicate

(b) Calcium aluminate

(c) Calcium aluminate ferrite

(d) Calcium carbonate

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I'm obligated to ask this question of Ingredients of Cement in portion Materials for Construction of Basic Civil Engineering

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The correct option is (c) Calcium aluminate ferrite

The best explanation: Calcium silicate and calcium aluminate are pure white minerals.  Calcium aluminate ferrite is brown in colour, but due to absorption of light by magnesium, present as an impurity, greenish grey colour is imparted to cement.

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