Question

WHICH IS THE RAREST ROCK AND MINERAL FOUND ON EARTH ?

Answer 1

Although, the common perception is always towards diamond, there are other rock materials that are even more rare such as Painite which as a place in the Guinness book of world records. Another rock that is know for its peculiar nature to change its colour depending on the light it receives, this rock is called Alexanderite.
The red beryl has special place due its very rare occurrence. It is know as red emerald(scarlet emerald). It is rich in manganese.