How hard is a rock?

Answer 1

Bedrock could vary in hardness from chalk to granite.

Answer 2

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 3

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 4

Harder than your head