Silicon Dioxide (known as Quartz) is not the hardest mineral, the hardest mineral is an allotrope of carbon called diamond. Quartz is only the 7th hardest mineral.
quartz
diomand
The hardest mineral is diamond, and the softest mineral is talc.
The softest known mineral is 'TALC'. The hardest known mineral is 'DIAMOND' (according to Friedrich Mohs scale)
i think sulfur is the softest and crystal is hardest
diamond is the hardest anywhere
Diamond used to be the hardest mineral now Lansdaleite and wurtzite boron nitride which were found on a meteor are now harder.
The hardest mineral is diamond, and the softest mineral is talc.
The hardest mineral is diamond, and the softest mineral is talc.
Diamond is the hardest mineral known.
Diamonds are the hardest mineral and the agate is the secod hardest mineral.
Diamond is the hardest mineral on earth.
C.
Diamonds are the hardest mineral, but not the 'strongest'.
The hardest substance in a rock would be the hardest mineral of which the rock is composed.
The softest known mineral is 'TALC'. The hardest known mineral is 'DIAMOND' (according to Friedrich Mohs scale)
A diamond and talc
The diamond is the hardest rock (or mineral).
Diamond is the hardest mineral currently known and is an allotrope of carbon.