minerals and stones exhibited the national history museum london

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Minerals and stones exhibited at the National History Museum in London Royalty Free Stock Photo

Minerals and stones exhibited at the National History Museum in London

In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure, that occurs naturally in pure form. Some natural solid substances without a definite crystalline structure, such as opal or obsidian, are more properly called mineraloids.[