Which one of the following minerals is found in Monazite sand? (1) Potassium (2) Uranium (3) Thorium (4) Sodium

Which one of the following minerals is found in Monazite sand? (1) Potassium (2) Uranium (3) Thorium (4) Sodium
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(3) Thorium Explanation: Monazite is a reddish-brown phosphate mineral containing rare earth metals. It occurs usually in small isolated crystals. There are actually at least four different kinds of monazite, depending on relative elemental composition of the mineral. Monazite is an important are for thorium, lanthanum, and cerium. It is often found in placer deposits. The deposits in India are particularly rich in monazite. It has a hardness of 5.0 to 5.5 and is relatively dense, about 4.6 to 5.7 g/ cm3.
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Which one of the following minerals is found in Monazite sand ? (1) Potassium (2) Uranium (3) Thorium (4) Sodium

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