How many minerals are present in the scale of fusibility given by Von Kobell?

Which of the following minerals can scratch Topaz?

Pick the quartz which is colourless among the following.

Minerals of equal hardness do no scratch each other.

Felspar is found abundantly or in majority in which kind of rock?

Carbonate minerals are found usually in _______

Mica is ______

What is the other name of muscovite mica?