Zinnwaldite Mineral Data

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.

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

Diaphaniety:

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:

None.

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

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.

Pleochroism (z):

reddish brown, golden yellow brown, dark brown, green, or opaque.

Calculated Properties of Zinnwaldite

Electron Density:

r_electron=2.99 gm/cc
note: r_Zinnwaldite=3.05 gm/cc.

Fermion Index

Fermion Index = 0.01309
Boson Index = 0.98691

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)

Estimated Radioactivity from Zinnwaldite - barely detectable

Zinnwaldite Classification

Dana Class:

71.2.2b.10 (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

Strunz Class:

VIII/H.11-00* VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.11 - Mica group, Biotite series

VIII/H.11-00* Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

VIII/H.11-10 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

VIII/H.11-20 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

VIII/H.11-30 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

VIII/H.11-35 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

VIII/H.11-40 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

VIII/H.11-50 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

VIII/H.11-60 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

VIII/H.11-70 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

VIII/H.11-80 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

VIII/H.11-90 Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

VIII/H.11-100 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

VIII/H.11-102 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

VIII/H.11-105 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

VIII/H.11-110 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

VIII/H.11-120 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

VIII/H.11-130 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

VIII/H.11-140 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

VIII/H.11-150 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

VIII/H.11-160 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

Other Zinnwaldite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Zinnwaldite

KLiFe++Al(AlSi3)O10(F,OH)2
Dana No: 71.2.2b.10 Strunz No: VIII/H.11-00*
Locality:

Notes: