The crystallographic system shown by felspar group is ______

Which among the following shows silky lustre?

Which mineral is used as refractory material?

What is the diaphaneity of muscovite mica?

The behaviour of a mineral towards the forces that tend to destroy it is called _______

Cleavage is described in terms of _______

What is the colour and diaphaneity of a calcite mineral respectively?

Augite mainly consists of ______