By using angle of Extinction, we can identify which one of these minerals?

A. Apatite

B. Muscovite

C. Augite

D. All of the above

Answer: Option D

Solution(By Examveda Team)

The angle of extinction is the measure between the cleavage direction or habit of a mineral and the extinction. To find this, simply line up the cleavage lines/long direction with one of the crosshairs in the microscope and turn the mineral until the extinction occurs.
By using the angle of extinction, we can identify all of these minerals given in the options Apatite, Muscovite, Augite etc.