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

Identify the type of structure shown below.

The crystallographic system shown by felspar group is ______

Which of the following is not true about plagioclase?

Which carbonate mineral has this chemical composition- CaCO3 Mg(CO3)2?

The mineral not belonging to the quartz group is _______

Pick the quartz mineral which is translucent among the following.

What is the hardness of the quartz minerals?