A pearl is composed of the mineral aragonite which has a hardness of 3.5-4.0.
Black jade typically has a hardness of around 6.5 to 7 on the Mohs scale, making it relatively durable and suitable for use in jewelry and carvings.
9 on the mohs scale
3
Iodine is not recognized as a mineral, and therefore is not assigned a number on the Mohs Scale of mineral hardness.
Diatomite has a hardness of around 5.5 on the Mohs scale of hardness.
A pearl is composed of the mineral aragonite which has a hardness of 3.5-4.0.
Black jade typically has a hardness of around 6.5 to 7 on the Mohs scale, making it relatively durable and suitable for use in jewelry and carvings.
4
9 on the mohs scale
Quartz has a hardness of 7 on the Mohs scale, making it relatively hard and durable.
On the Mohs scale, 6.5 to 7.0.
3
The hardness of uranium is 6 on the Mohs scale; not so hard.
Iodine is not recognized as a mineral, and therefore is not assigned a number on the Mohs Scale of mineral hardness.
It is about 2.5 in the Mohs Hardness Scale.
look it up on the mohs scale