Mineralogy Database

Zinnwaldite Mineral Data

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General Zinnwaldite Information

Help on Chemical  Formula: Chemical Formula: KLiFe++Al(AlSi3)O10(F,OH)2
Help on Composition: Composition: Molecular Weight = 437.10 gm
   Potassium   8.94 %  K    10.78 % K2O
   Lithium     1.59 %  Li    3.42 % Li2O
   Aluminum   12.35 %  Al   23.33 % Al2O3
   Iron       12.78 %  Fe   16.44 % FeO
   Silicon    19.28 %  Si   41.24 % SiO2
   Hydrogen    0.12 %  H     1.03 % H2O
   Oxygen     38.43 %  O
   Fluorine    6.52 %  F     6.52 % F
                -   %   F    -2.75 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KLiFe2+Al2Si3O10F1.5(OH)0.5
Help on Environment: Environment: Pneumatolytic mineral occurring in cassiterite and topaz-bearing pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1845
Help on Locality: Locality: Erzgebirge of Saxony at Zinnwald (now Cinovec) - "Ore Mountains", Czechoslovakia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Zinnwaldite + Pronunciation Say ZINNWALDITE
Help on Synonym: Synonym: Lithionite
 

Zinnwaldite Image

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  Zinnwaldite

Comments: Zinnwaldite crystal section.
Location: Wig-Wam Creek, Jefferson County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Zinnwaldite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5736:1:2.1791
Help on Cell Dimensions: Cell Dimensions: a = 5.27, b = 9.187, c = 20.02, Z = 4; beta = 101° V = 951.47 Den(Calc)= 3.05
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.29(1), 9.8(0.8), 1.98(0.55),
 

Physical Properties of Zinnwaldite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Light brown, Silvery white, Gray, Yellowish white, Greenish white.
Help on Density: Density: 2.9 - 3.1, Average = 3
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Zinnwaldite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2049,KPDmeas= 0.2083,KC= 0.2031
Ncalc = 1.59 - 1.63
Help on Optical Data: Optical Data: Biaxial (-), a=1.565-1.625, b=1.605-1.675, g=1.605-1.675, bire=0.0400-0.0500, 2V(Calc)=0, 2V(Meas)=30. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): yellow, buff, light brown, or green pale.
Help on Pleochroism (y): Pleochroism (y): reddish brown, greenish brown, bluish green, deep brown, or opaque.
 

Calculated Properties of Zinnwaldite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Zinnwaldite =3.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEZinnwaldite = 5.85 barns/electron
U=PEZinnwaldite x relectron= 17.46 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 126.36 (Gamma Ray American Petroleum Institute Units)
Concentration of Zinnwaldite per GRapi unit = 0.79 (%)

Estimated Radioactivity from Zinnwaldite - barely detectable

 

Zinnwaldite Classification

Help on  Dana Class: Dana Class: 71.02.02b.10 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.02)with 2:1 Layers
  (71.02.02b)Mica Group (Biotite subgroup)
 
71.02.02b.01 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m
 
71.02.02b.01a Tetraferriphlogopite! KMg3FeSi3O10(OH)2 2/m
 
71.02.02b.01b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m
 
71.02.02b.01c Fluorophlogopite! KMg3(AlSi3)O10F2 C 2/m 2/m
 
71.02.02b.02 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m
 
71.02.02b.03 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m
 
71.02.02b.03a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m
 
71.02.02b.04 Tetraferriannite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m
 
71.02.02b.05 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m
 
71.02.02b.05a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m
 
71.02.02b.06 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m
 
71.02.02b.07 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono
 
71.02.02b.08 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m
 
71.02.02b.08a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m
 
71.02.02b.08b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono
 
71.02.02b.09 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m
 
71.02.02b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m
 
71.02.02b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m
 
71.02.02b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m
 
71.02.02b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m
 
71.02.02b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m
 
71.02.02b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m
 
71.02.02b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m
 
71.02.02b.18 Suhailite! (NH4)Fe3(Si3Al)O10(OH)2 C 2/m? 2/m
Help on  Strunz Class: Strunz Class: 09.EC.20 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
 
09.EC.20 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m
 
09.EC.20 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m
 
09.EC.20 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m
 
09.EC.20 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m
 
09.EC.20 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m
 
09.EC.20 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono
 
09.EC.20 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m
 
09.EC.20 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m
 
09.EC.20 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m
 
09.EC.20 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m
 
09.EC.20 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m
 
09.EC.20 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m
 
09.EC.20 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m
 
09.EC.20 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m
 
09.EC.20 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m
 
09.EC.20 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m
 
09.EC.20 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m
 
09.EC.20 Tetraferriannite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m
 
09.EC.20 Tetraferriphlogopite! KMg3FeSi3O10(OH)2 2/m
 
09.EC.20 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m
 
09.EC.20 Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono
 
09.EC.20 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m
 
09.EC.20 Suhailite! (NH4)Fe3(Si3Al)O10(OH)2 C 2/m? 2/m
 
09.EC.20 Fluorophlogopite! KMg3(AlSi3)O10F2 C 2/m 2/m
 

Other Zinnwaldite Information

Help on See Also: See Also: Links to other databases for Zinnwaldite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - Philatelic Mineralogy
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Print or Cut-and-Paste your Zinnwaldite Specimen Label here :

Zinnwaldite

KLiFe++Al(AlSi3)O10(F,OH)2
Dana No: 71.02.02b.10 Strunz No: 09.EC.20
Locality:

 

Notes:

 

 


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