Lepidolite Mineral Data + Say LEPIDOLITE

General Lepidolite Information
Help on Chemical Formula: Chemical Formula: K(Li,Al)3(Si,Al)4O10(F,OH)2
Help on Composition: Composition: Molecular Weight = 388.30 gm
   Potassium  10.07 %  K    12.13 % K2O
   Lithium     3.58 %  Li    7.70 % Li2O
   Aluminum    6.95 %  Al   13.13 % Al2O3
   Silicon    28.93 %  Si   61.89 % SiO2
   Hydrogen    0.26 %  H     2.32 % H2O
   Oxygen     45.32 %  O
   Fluorine    4.89 %  F     4.89 % F
                -   %  F    -2.06 % -O=F2
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KLi2AlSi4O10F(OH)
Help on Environment: Environment: Lithia-bearing pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1792
Help on Locality: Locality: Pala, San Diego Co., California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek lepidion - "scale" and lithos - "stone."
Help on Synonym: Synonym: Lithium Mica
 

Lepidolite Image

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Lepidolite

Comments: Pale lavender micaceous plates of lepidolite on matrix.
Location: Minas Gerais, Brazil. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Lepidolite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5808:1:2.2474
Help on Cell Dimensions: Cell Dimensions: a = 5.21, b = 8.97, c = 20.16, Z = 4; beta = 100.8° V = 925.46 Den(Calc)= 2.79
Help on Crystal System: Crystal System: MonoclinicSpace Group: C 2/m,Cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.34(1), 4.99(0.75), 10(0.75),
Help on Forms: Forms:

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Forms: [ 1 1 2] [ 2 2 1] [ 0 1 0] [ 0 0 1]

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Hendricks S B , Jefferson M E , American Mineralogist , 24 (1939) p.729-771, Polymorphism of the micas with optical measurements

View Additional jPOWD Structure files for Lepidolite
[1]
 

Physical Properties of Lepidolite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Colorless, Gray white, Lilac, Yellowish, White.
Help on Density: Density: 2.8 - 2.9, Average = 2.84
Help on Diaphaniety: Diaphaniety: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Lepidolite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.084 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1998,KPDmeas= 0.1956,KC= 0.2135
Help on Optical Data: Optical Data: Biaxial (-), a=1.525-1.548, b=1.551-1.58, g=1.554-1.586, bire=0.0290-0.0380, 2V(Calc)=36-46, 2V(Meas)=25-58. Dispersion weak, r > v.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Lepidolite

Help on Electron Density: Electron Density:

relectron=2.76 gm/cc
note: rLepidolite =2.79 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01642
Boson Index = 0.98358
Help on Photoelectric: Photoelectric:

PELepidolite = 2.38 barns/electron
U=PELepidolite x relectron= 6.56 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 143.68 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Lepidolite - barely detectable

 

Lepidolite Classification
Help on Dana Class: Dana Class: 71.2.2b.7 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.2)with 2:1 Layers
  (71.2.2b)Mica Group (Biotite subgroup)
 
71.2.2b.1 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m
 
71.2.2b.1a Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m
 
71.2.2b.1b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m
 
71.2.2b.2 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m
 
71.2.2b.3 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m
 
71.2.2b.3a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m
 
71.2.2b.4 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m
 
71.2.2b.5 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m
 
71.2.2b.5a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m
 
71.2.2b.6 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m
 
71.2.2b.7 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono
 
71.2.2b.8 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m
 
71.2.2b.8a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m
 
71.2.2b.8b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono
 
71.2.2b.9 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m
 
71.2.2b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m
 
71.2.2b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m
 
71.2.2b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m
 
71.2.2b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m
 
71.2.2b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m
 
71.2.2b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m
 
71.2.2b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m
 
71.2.2b.17 IMA2004-049! NaMg3(AlSi3)O10(OH)2 C 2/m 2/m
Help on Strunz Class: Strunz Class: VIII/H.12-00 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups
  VIII/H.12 - Mica group, Lepidolite series
 

Other Lepidolite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Lepidolite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - CalTech Mineral Spectroscopy 6 - Crocoite.com Mineral Locations 7 - EUROmin Project 8 - Glendale Community College 9 -Google Images 10 -Google Scholar 11 -Handbook of Mineralogy (MinSocAm) 12 -Handbook of Mineralogy (UofA) 13 -MinDAT 14 -MinMax(Deutsch) 15 -MinMax(English) 16 -Mineralienatlas (Deutsch) 17 - Minerals of Wisconsin 18 -QUT Mineral Atlas 19 - Scandinavian mineral gallery 20 - WWW-MINCRYST 21 -École des Mines de Paris

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Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2
Dana No: 71.2.2b.7 Strunz No: VIII/H.12-00
Locality:

 

Notes:

 
 
   
 
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