Sapphire has a hardness of 9 on the Mohsscale and is also extremely tough.
蓝宝石具有硬度大、9月的层数也非常强硬。
2
Human teeth are harder than gold but softer than pyrite, according to the Mohs Hardness Scale, which categorizes how easily minerals scratch.
根据莫氏硬度表,人类牙齿的硬度比黄金大但比黄铁矿小。
3
Diamonds are a 10 on the MOHS Hardness Scale which means that they are not only the hardest mineral, but they are actually the hardest substance on earth.