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From Wikipedia, the free encyclopedia
In geology and mineralogy, a mineral variety is a subset of a mineral species or mineraloid with some special characteristic, such as specific impurities or structural defects.[1] For example, amethyst is a variety of quartz with a purple tinge due in part to iron impurities.
Mineral varieties can be further subdivided into sub-varieties.[1]
Unlike mineral species, mineral varieties are not defined or named by the International Mineralogical Association (IMA).
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