Lepidolite

Lepidolite

Infobox mineral
name = Lepidolite
category = Silicate mineral
boxwidth =
boxbgcolor =


imagesize =
caption = Crystal of lepidolite, Brazil
formula = KLi2Al(Al,Si)3O10(F,OH)2
molweight =
color = Pink, purple, rose-red, violet-gray,yellowish, white, colorless
habit = Tabular to prismatic pseudohexagonal crystals, scaly aggregates and massive
system = Monoclinic
twinning = Rare, composition plane
cleavage = [001] Perfect
fracture = Uneven
mohs = 2.5 - 3
luster = Vitreous to pearly
polish =
refractive = a=1.525-1.548, b=1.551-1.58, g=1.554-1.586
opticalprop = Biaxial (-)
birefringence = 0.0290-0.0380
dispersion =
pleochroism =
fluorescence=
absorption =
streak =
gravity = 2.8 - 2.9
density =
melt =
fusibility =
diagnostic =
solubility =
diaphaneity = Transparent to translucent
other =
references = http://rruff.geo.arizona.edu/doclib/hom/lepidolite.pdf Handbook of Mineralogy] [http://webmineral.com/data/Lepidolite.shtml Webmineral]

Lepidolite (KLi2Al(Al,Si)3O10(F,OH)2) is a lilac or rose-violet colored phyllosilicate mineral of the mica group that is a secondary source of lithium. ["Manual of Mineralogy, 20th Ed." by Cornelius Hurlbut and Cornelis Klein.] It is associated with other lithium-bearing minerals like spodumene in pegmatite bodies. It is one of the major sources of the rare alkali metals, rubidium and caesium. [H. Nechamkin, "The Chemistry of the Elements", McGraw-Hill, New York, 1968.] In 1861 Robert Bunsen and Gustav Kirchhoff extracted 150 kg of lepidolite and yielded few grams of rubidium salts for analysis, and therefore discovered the new element rubidium. [cite journal
title = Chemische Analyse durch Spectralbeobachtungen
pages = 337–381
author = G. Kirchhoff, R. Bunsen
doi = 10.1002/andp.18611890702
journal = Annalen der Physik und Chemie
volume = 189
issue = 7
year = 1861]

It occurs in granite pegmatites, in some high-temperature quartz veins, greisens, and granites. Associated minerals include: quartz, feldspar, spodumene, amblygonite, tourmaline, columbite, cassiterite, topaz and beryl.

Notable Occurrences: Brazil; Ural Mountains, Russia; California; Tanco Pegmatite, Bernic Lake Manitoba, Canada, Madagascar.

References


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  • Lépidolite — Catégorie IX : silicates[1] Lépidolite, Itinga, Jequitinhonha valley, Minas Gerais …   Wikipédia en Français

  • lépidolite — [ lepidɔlit ] n. m. VAR. lépidolithe • 1808, 1803; de lépido et lite ( lithe) ♦ Minér. Mica blanc ou rose violacé, qui constitue le principal minerai de lithium. ● lépidolite nom masculin Mica lithinifère qui constitue le principal minerai de… …   Encyclopédie Universelle

  • Lepidolite — Le*pid o*lite (l[ e]*p[i^]d [ o]*l[imac]t; 277), n. [Gr. lepi s i dos, a scale + lite: cf. F. l[ e]pidolithe.] (Min.) A species of mica, of a lilac or rose violet color, containing lithia. It usually occurs in masses consisting of small scales.… …   The Collaborative International Dictionary of English

  • lepidolite — [li pid′ə līt΄, lep′i dō līt΄] n. [ LEPIDO + LITE] mica that contains lithium, commonly occurring in scaly masses of rose, lilac, or gray color …   English World dictionary

  • lepidolite — Mica Mi ca, n. [L. mica crumb, grain, particle; cf. F. mica.] (Min.) The name of a group of minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic. They differ widely in… …   The Collaborative International Dictionary of English

  • lepidolite — /li pid l uyt , lep i dl /, n. a mineral of the mica group, potassium lithium aluminum silicate, commonly occurring in lilac, rose colored, or whitish scaly masses: an ore of lithium. [1790 1800; LEPIDO + LITE] * * * ▪ mineral also called  lithia …   Universalium

  • lepidolite — lepidolitas statusas T sritis chemija apibrėžtis Mineralas. formulė K(Li,Al)₂[(Si,Al)₄O₁₀](F,OH)₂ atitikmenys: angl. lepidolite rus. лепидолит …   Chemijos terminų aiškinamasis žodynas

  • lepidolite — noun Etymology: German Lepidolith, from lepid + lith Date: circa 1796 a variable form of mica used especially in glazes and enamels and as a source of lithium …   New Collegiate Dictionary

  • lepidolite — noun A pale lilac mica mineral that is a mixed basic fluoride and aluminosilicate of potassium, lithium and aluminium …   Wiktionary

  • lepidolite — le·pi·do·lì·te s.f. TS mineral. minerale monoclino del gruppo delle miche, che si presenta in masse scagliose o fogliacee di colore bianco, roseo o viola pallido e cristallizza nel sistema monoclino {{line}} {{/line}} DATA: 1819. ETIMO: comp. di… …   Dizionario italiano

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