lepidolite

[li-pid-l-ahyt, lep-i-dl-]
noun
a mineral of the mica group, potassium lithium aluminum silicate, commonly occurring in lilac, rose-colored, or whitish scaly masses: an ore of lithium.

Origin:
1790–1800; lepido- + -lite

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lepidolite (lɪˈpɪdəˌlaɪt, ˈlɛpɪdəˌlaɪt)
 
n
a lilac, pink, or greyish mica consisting of a hydrous silicate of lithium, potassium, aluminium, and fluorine, containing rubidium as an impurity: a source of lithium and rubidium. Formula: K2Li3Al4Si7O21(OH,F)3

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Encyclopedia Britannica
Encyclopedia

lepidolite

the most common lithium mineral, basic potassium and lithium aluminosilicate; a member of the common mica group. It is economically important as a major source of lithium. Because it is one of the few minerals containing appreciable amounts of rubidium, it is useful in determining geological age according to strontium-rubidium ratios. Lepidolite occurs almost exclusively in granite pegmatites. For chemical formula and detailed physical properties, see mica (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Lepidolite, a third mica species, often has an attractive lilac color.
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