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It takes many different
kinds of rock to make up this dense earth we live on.
It takes one or more minerals to make up these rocks, but they are formed
in different ways.
A mineral is not an organic substance, they are inoganic (unlike plants
and animals that are organic).
Out of roughly 4,000 minerals known to man, there are as little as a
dozen really common, but all these minerals are the basic building blocks
of the earth.
We can all see such
minerals when we place a rock under a microscope, in the majority of
cases minerals are found to have a very clear shape , and it is these
shapes we refer to as crystals, the crystals are packed together very
tightly.
With some stone it is possible to see these crystals without a microscope,
such as granite (igneous) which is a very coarse material.
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