1 Answers
Answer: Option 1
Kerala has the largest reserves of monazite, with a high thorium content. Monazite is a reddish-brown phosphate mineral containing rare-earth metals. It occurs usually in small isolated crystals. It has a hardness of 5.0 to 5.5 on the Mohs scale of mineral hardness and is relatively dense, about 4.6 to 5.7 g/cm3.
4 views
Answered