Lepidolite is mostly used for decoration and for mineral
collections.
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California, to name one.
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Many types of mica are known: biotite, lepidolite, muscovite,
phlogopite, zinnwaldite, clintonite, illite, phengite.
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Go to Wikipedia- http://en.wikipedia.org/wiki/Rubidium
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Today, most rubidium is produced as a byproduct of the lithium
refinement process. Rubidium was originally found in 1861 when
Robert Bunsen and Gustav Kirchhoff analyzed lepidolite.