How many groups are the felspar minerals classified into, on the basis of chemical composition?

Agate is not found banded.

Colour changing phenomenon which involves oxidation is ________

Which is the less important and more important and less important minerals crystallize respectively?

Which of the following is not true about plagioclase?

Type of shine or lustre associated with lustre of diamond is _______

The carbonate minerals have high hardness.

Metallic minerals belong to which category with respect to colour?