Minerals occur naturally and have a fixed chemical composition is the best statement that describes how minerals are different from rocks.
A mineral is a natural inorganic substance, which has a defined atomic structure and composition, which can sometimes be found in association with other types of rock.
Their composition can be represented by a formula (although on some occasions this formula is not necessarily fixed and can vary within defined margins).
They are made up of crystalline matter (ordered atomic arrangement), the few solid and naturally occurring substances that are amorphous (with disordered atomic arrangement) are called mineraloids.
The basic difference is that a rock is a solid aggregate formed by defined mineral groups of natural origin, one or more types of minerals that compose it.
That is, we call rocks the most common associations of one or more minerals, which occur in large areas on Earth or in other planetary bodies.
Rocks can be classified into three large families:
Therefore, we can conclude that minerals occur naturally and have a fixed chemical composition is the best statement that describes how minerals are different from rocks.
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