Bedrock could vary in hardness from chalk to granite.
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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.
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
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.
Hard rock is typically classified as igneous or metamorphic rock, which are formed from the cooling of molten magma or the alteration of existing rock due to heat and pressure. It is known for its durability and resistance to weathering. Examples of hard rock include granite, basalt, and schist.
It is a limestone, hard.
a sharp hard rock
A hard grey rock beginning with f
Old Harry is made out of hard rock, specifically chalk. It is a stack of chalk rocks located off the coast of Dorset in southern England.