How hard is a rock?

Answer 1

Bedrock could vary in hardness from chalk to granite.

Answer 2

The hardness of a rock can vary widely depending on the type of rock. Some rocks like granite are very hard, while others like limestone are much softer. Hardness is typically measured on the Mohs scale, with diamond being the hardest at a 10 and talc being the softest at a 1.

Answer 3

The Mohs Scale of Hardness consists of 10 classifications, 1 being the softest and up to 10 being the hardest. The diamond is the hardest and is rated 10. The following, is a partial listing of stones and their hardness classification:

1, Talc and Graphite

Can be scratched with a fingernail and by any stone and is rated at 2+

2, Gypsum, Bismuth, Lepidolite , and Chlorite

Can be scratched with a fingernail and any stone and is rated 3+

3, Calcite, Celestite and Barite

Can be scratched with a knife and any stone and is rated 4+

4, Flourite, Malachite and Platinum

Can be scratched with a knife and any stone rated 5+. And will scratch any stone rated 3-.

5, Apatite, Dioptase

Can be scratched with a knife and any stone rated 6+. And will scratch any stone rated 4-

6, Feldspar , Pyrite, Amazonite, Hematite

Can be scratched with a knife and any stone rated 7+. And will scratch any stone rated 5-.

6, Quartz, Tourmaline

Will scratch glass and any stone rated 6-. And can be scratched by stones 8+.

7, Topaz, Spinel

Will scratch glass and any stone rated 7-. And can be scratched by stones 9-10.

9, Corundum (ruby, sapphire)

Will scratch glass and any stone rated 8-. And can be scratched by diamond.

10, Diamond

Will scratch glass and all stones 1-9

Answer 4

Yes most rocks are hard to break, but some stones aren't a simple throw on the floor can break them in half, the bigger the rock the harder the shell, but sometimes that isn't the case.

Answer 5

Harder than your head