What is the second hardest mineral on earth?

Question

Curious on what the second hardest mineral on earth is.... i know that a diamond is the hardest mineral.

Answer 1

Well, probably the most well know are rubies or sapphires (conundrums) They have a hardness of about 9 on the MOHS scale.

Answer 2

My head!

Answer 3

topaz

Answer 4

Well, the hardest mineral on earth is a diamond. For rocks, which are made up of one or more minerals, the hardest are those which contain quartz. There is no single "hardest rock" but some of the rocks that would be very hard and strong and well-cemented quartz sandstones (a sedimentary rock), quartzite (a metamorphic rock formed from quartz sandstone) and granites or rhyolites (both igneous rocks with a lot of quartz).

Sapphire and ruby are varieties of corundum. Twice as hard as topaz.



Diamond

Four times as hard as corundum.

Answer 5

sapphire and ruby of course.

other corundum varieties, like chrysoberyl, are less hard than sapphire and ruby

by the way, sapphire is the most valuable gem in the world as opposed to flawless, same size diamond. really surprising,

Answer 6

Corundum (ruby and sapphire)

Answer 7

Corundum