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Lepidolite

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System:
Monoclinic
Colour:
Pink, light purple, ...
Hardness:
2½ - 3½
Member of:
Name:
Named in 1792 by Martin Klaproth from the Greek words Lepidos for "scale" and Lithos for "stone".
Series Formula:
KLi2Al(Si4O10)(F,OH)2 to K(Li1.5Al1.5)(AlSi3O10)(F,OH)2
A series between Polylithionite and Trilithionite

A Li-rich mica in, or close to, the so-called Polylithionite-Trilithionite series.

The original lepidolite came from Rožná pegmatite, Žďár nad Sázavou, Vysočina Region, Moravia (Mähren; Maehren), Czech Republic.

The name is sometimes incorrectly applied to lithian muscovite.

Visit gemdat.org for gemological information about Lepidolite.

Classification of Lepidolite

Discredited 1989
Explanation of status:
Redefined as a series in 1989 by the Mica subcommittee of the IMA (Rieder et al., 1998).
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http://www.mindat.org/min-2380.html
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Occurrences of Lepidolite

Geological Setting:
May be found in aplites associated with granite pegmatite. rarely found in hydrothermal veins and extremely rarely in granite contact zones.

Physical Properties of Lepidolite

Sub-Vitreous, Resinous, Greasy, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Pink, light purple, light rose red, other colors possible but are rare.
Comment:
Ideally colorless, but frequently occurs in manganese-bearing environments
Streak:
white
Hardness (Mohs):
2½ - 3½
Tenacity:
Elastic
Cleavage:
Perfect
{001} perfect
Fracture:
Micaceous
Density:
2.8 - 2.9 g/cm3 (Measured)    2.83 g/cm3 (Calculated)
Comment:
Calculated densities for various polytypes to 3.11

Crystallography of Lepidolite

Crystal System:
Monoclinic
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Relationship of Lepidolite to other Species

Member of:
Other Members of Group:
AluminoceladoniteK(Mg,Fe2+)Al(Si4O10)(OH)2
Anandite(Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2
AnniteKFe32+(AlSi3O10)(OH)2
Annite-Phlogopite Series
AspidoliteNaMg3(AlSi3O10)(OH)2
BalestraiteKLi2V5+Si4O12
Biotite
BityiteLiCaAl2(AlBeSi2O10)(OH)2
BoromuscoviteKAl2(BSi3O10)(OH)2
Brammallite(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Chernykhite(Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2
ChromceladoniteK(Mg,Fe2+)(Cr,Al)(Si4O10)(OH)2
ChromphylliteK(Cr,Al)2(AlSi3O10)(OH,F)2
ClintoniteCa(Mg,Al)3(Al3SiO10)(OH)2
EastoniteKMg2Al(Al2Si2O10)(OH)2
EphesiteLiNaAl2(Al2Si2O10)(OH)2
FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
Ferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2
FluoranniteKFe32+(AlSi3O10)(F,OH)2
FluorophlogopiteKMg3(AlSi3O10)(F,OH)2
Ganterite(Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2
Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
HendricksiteK(Zn,Mg,Mn2+)3(AlSi3O10)(OH)2
IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Kinoshitalite(Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2
LuanshiweiiteKLiAl1.5□0.5(Si3.5Al0.5)O10(OH,F)2
MargariteCaAl2(Al2Si2O10)(OH)2
Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4
MuscoviteKAl2(AlSi3O10)(OH)2
Muscovite-Celadonite Series
NanpingiteCsAl2(AlSi3O10)(OH,F)2
Natro-glauconite(Na,K)(Fe3+,Al,Mg)2((Si,Al)4O10)(OH)2
NorrishiteKLiMn23+(Si4O10)O2
Oxykinoshitalite(Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2
OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2
ParagoniteNaAl2(AlSi3O10)(OH)2
Phengite
PhlogopiteKMg3(AlSi3O10)(OH)2
PolylithioniteKLi2Al(Si4O10)(F,OH)2
PreiswerkiteNaMg2Al(Al2Si2O10)(OH)2
RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
ShirokshiniteKNaMg2(Si4O10)F2
ShirozuliteK(Mn2+,Mg)3(AlSi3O10)(OH)2
SiderophylliteKFe22+Al(Al2Si2O10)(OH)2
SokolovaiteCsLi2Al(Si4O10)F2
Suhailite(NH4)Fe32+(AlSi3O10)(OH)2
TainioliteKLiMg2(Si4O10)F2
TetraferrianniteKFe32+((Fe3+,Al)Si3O10)(OH)2
TetraferriphlogopiteKMg3(Fe3+Si3O10)(OH,F)2
Tobelite(NH4,K)Al2(AlSi3O10)(OH)2
TrilithioniteK(Li1.5Al1.5)(AlSi3O10)(F,OH)2
VoloshiniteRb(LiAl1.51.5)(Al0.5Si3.5)O10F2
Wonesite(Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4
YangzhumingiteKMg2.5(Si4O10)F2
ZinnwalditeKLiFe2+Al(AlSi3O10)(F,OH)2

Other Names for Lepidolite

Name in Other Languages:

Other Information

Frequently fluoresces medium intensity of creamy white to pale yellow. Sometimes yellow.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
Ore of lithium, cesium, and rubidium.

References for Lepidolite

Reference List:
Schaller, Waldemar Theodore (1905), Crystallography of lepidolite: American Journal of Science, 4th. Series: 19: 225-226.

Stevens, Rollin Elbert (1938), New analyses of lepidolites and their interpretation: American Mineralogist: 23: 607-628.

Mineralogical Record (1989): 20: 109.

Rieder et al (1998) Nomenclature of the micas. Canadian Mineralogist: 36: 905-912.

Mineralogical Magazine (1999): 63: 267-279.

Kogure, T. and Bunno, M. (2004) Investigation of polytypes in lepidolite using electron back-scattered diffraction. American Mineralogist: 89: 1680-1684.

Internet Links for Lepidolite

Specimens:
The following Lepidolite specimens are currently listed for sale on minfind.com.

Localities for Lepidolite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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