In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/geology/minerals/mineral/wikipedia/en.wikipedia.org.md
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The concept of mineral is distinct from rock, which is any bulk solid geologic material that is relatively homogeneous at a large enough scale.
The concept of mineral is distinct from rock, which is any bulk solid geologic material that is relatively homogeneous at a large enough scale.