Zinnwaldite Mineral Data

General Zinnwaldite Information

Chemical Formula:

KLiFe++Al(AlSi3)O10(F,OH)2

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

Empirical Formula:

KLiFe²⁺Al₂Si₃O₁₀F_1.5(OH)_0.5

Environment:

Pneumatolytic mineral occurring in cassiterite and topaz-bearing pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1845

Locality:

Erzgebirge of Saxony at Zinnwald (now Cinovec) - "Ore Mountains", Czechoslovakia. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Zinnwaldite + Pronunciation

Synonym:

Lithionite

Zinnwaldite Image

Images:

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

Axial Ratios:

a:b:c =0.5736:1:2.1791

Cell Dimensions:

a = 5.27, b = 9.187, c = 20.02, Z = 4; beta = 101° V = 951.47 Den(Calc)= 3.05

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.29(1), 9.8(0.8), 1.98(0.55),

Crystal Structure:

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Guggenheim S , Bailey S W , American Mineralogist , 62 (1977) p.1158-1167, The refinement of zinnwaldite-1M in subgroup symmetry, Note: the sample is from the Sadisdorf Mine dump, East Germany

Physical Properties of Zinnwaldite

Cleavage:

{001} Good

Color:

Light brown, Silvery white, Gray, Yellowish white, Greenish white.

Density:

2.9 - 3.1, Average = 3

Diaphaneity:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Micaceous - Platy texture with "flexible" plates.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Zinnwaldite

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

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.

Pleochroism (x):

yellow, buff, light brown, or green pale.

Pleochroism (y):

reddish brown, greenish brown, bluish green, deep brown, or opaque.

Calculated Properties of Zinnwaldite

Electron Density:

Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Zinnwaldite =3.05 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Zinnwaldite= 5.85 barns/electron
U=PE_Zinnwaldite x r_electron= 17.46 barns/cc.

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

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

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

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: