The minerals which develop electric charge upon heating are called ______

Which among the following shows silky lustre?

Quartz is found in which type of rock?

The felspar minerals are free from ______

Kyanite shows which form?

The phenomenon due to which a mineral shows rainbow colours is?

What is the hardness of the quartz minerals?

The type of cleavage due to the mineral can be split very easily is _______