Dolomite is formed by the action of magnesian rich sea water on which deposit?

What is the distinguishing characteristic of microcline and orthoclase?

Which among the following shows silky lustre?

A colour is produced due to _______

Colour changing phenomenon which involves oxidation is ________

The carbonate minerals have high hardness.

Metallic minerals belong to which category with respect to colour?

The semi-precious gemstone not belonging to corundum is ___________