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Lepidolite

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lepidolite [lə′pid·əl‚īt]
(mineralogy)
K(Li,Al)3(Si,Al)4O10(F,OH)2A rose-colored mineral of the mica group crystallizing in the monoclinic system. Also known as lithionite; lithium mica.
Lepidolite 

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.
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The principal lithium pegmatite minerals are spodumene, petalite and lepidolite.
Will electrification ignite a lithium boom? by Richard (Rick) Mills / Stockhouse
Klaproth discovered the presence of potassium in leucite and lepidolite, it occurred with L.
Alchemical and Later Discoveries and Uses of Alum (Mineral) by Jeremy Stone / News, opinion and commentary community
London and Evensen, 2002); (3) an increase in the Ca content of the fluids by interaction with the host schist; (4) an increase in host-rock permeability or porosity reflecting either rock type differences or fracture propagation related to deformation accommodating cooling of the granite pluton below; (5) precipitation of lepidolite within the vein selvage, removing F (ligand) and Li (buffer) from the fluids; or (6) simply because of decreases in pressure and/or temperature.
Emerald and aquamarine mineralization in Canada by Neufeld, Heather L.D. / Geoscience Canada
 
 
 
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