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K(Li,Al)3(Si,Al)4O10(F,OH)2 A rose-colored mineral of the mica group crystallizing in the monoclinic system. Also known as lithionite; lithium mica.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a mineral of the mica group; by structure, classified as a trioctahedral mica. The approximate chemical composition of lepidolite is KLi1,5 Al1,5 [AlSi3O10] (F, OH), with a Li2O content varying between 1.23 and 5.90 percent. Principal admixtures include Fe2+, Mn, Cs, Rb, and Na. Lepidolite crystallizes in the monoclinic system, forming lamellar crystals and fine-grained scaly masses. The color generally varies from pink to pale violet; colorless varieties are rare. Lepidolite has a hardness of 2.5–3.5 on Mohs’ scale and a density of 2,800–2,900 kg/m3. It occurs in granitic pegmatites in association with pink tourmaline, spodumene, albite, cassiterite, and minerals containing Nb and Ta. Lepidolite is rarely found in greisenized granites and hydrothermal formations. Lepidolite ore is a source of Li and its salts; Cs is sometimes also extracted.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
A total of 307m of trenching for nine trenches were excavated at the project and lepidolite rich pegmatites were found to occur in the lower walls, extending to floors of the trenches.
Venus is planning to continue the lithium (Lepidolite) exploration at prospective target areas within the tenement.
The petalite production will be supplemented with lepidolite production, which is also in growing demand.
Specimens with garlands of purple lepidolite crystals on feldspar crystals were smiling at me!
The majority of pegmatites occurring in the Sahatany Valley are of the Complex Type (LCT) (lithium-cesium-tantalum) with subtypes rich in lepidolite, elbaite and danburite.
It should be noted that some of the intercepts from this area, in addition to North Ravensthorpe, include a small proportion of the lithium-bearing mineral lepidolite, in addition to spodumene.
First mineralogical descriptions and chemical characterization of clay minerals and related phyllosilicates, including their macrocrystalline equivalents denoting mineral species or giving group and series names, go back to the 18th century: chlorite /a group name/, lepidolite /a series name/, mica /a group name/, montmorillonite, talc; terms mica, kaolinite (or kaolin), talc, similarly as "clay" or fuller's earth (Robertson, 1986), being still much older.
The maiden RC drilling programme (announced 25 June 2019) was designed to test down-dip extensions of outcropping lithium-bearing pegmatites where rock-chip samples yielding up to 4.2% Li2O had been identified and lepidolite mineralisation observed in RC drill cuttings.