state the value of rocks​

Sagot :

The three major classes of rock are igneous, sedimentary, and metamorphic rock. ... so essentially in the solid state, rather than by complete remelting, ...

Answer:

The harder a mineral is, the more likely it is to be valuable. If you can scratch the mineral with your fingernail, it has a hardness of 2.5 mohs, which is very soft, If you can scratch it with a penny, it's hardness is 3 mohs, and if it takes a piece of glass to scratch it, the hardness is 5.5 mohs.

Rocks are not a common yard sale item, but people occasionally sell rocks along with their inexpensive jewelry.