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Zinnwaldite

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Formula:
KLiFe2+Al(AlSi3O10)(F,OH)2
System:
Monoclinic
Colour:
Greyish-brown, ...
Lustre:
Vitreous, Pearly
Hardness:
2½ - 4
Member of:
Name:
Named after its discovery locality at Zinnwald, on the border between Germany and the Czech Republic. Zinnwald was named for its tin deposits.
Series Formula:
KFe22+Al(Al2Si2O10)(OH)2 to KLi2Al(Si4O10)(F,OH)2
A series between Siderophyllite and Polylithionite

Mica Group.

No longer a species - a series of trioctahedral micas on, or close to, the siderophyllite-polylithionite join; dark micas containing lithium (Rieder et al., 1998).

-1M, -2M, and -3T polytypes are known.

The original zinnwaldite material came from Cínovec / Zinnwald (Cinvald), Erzgebirge; Krusné Hory Mts, Saxony & Ústí Region (Bohemia; Böhmen; Boehmen), Germany & Czech Republic.



Classification of Zinnwaldite

Discredited
9..

9 : SILICATES (Germanates)
:
:
71.2.2b.10

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
17.2.9

17 : Silicates Containing other Anions
2 : Silicates with fluoride

Physical Properties of Zinnwaldite

Vitreous, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Greyish-brown, yellowish-brown, pale violet or pink, silver-grey, green-grey, nearly black
Hardness (Mohs):
2½ - 4
Density:
2.9 - 3.02 g/cm3 (Measured)    2.831 g/cm3 (Calculated)

Optical Data of Zinnwaldite

Type:
Biaxial (-)
RI values:
nα = 1.565 - 1.625 nβ = 1.605 - 1.675 nγ = 1.605 - 1.675
2V:
Measured: 30°
Max Birefringence:
δ = 0.040 - 0.050
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of Zinnwaldite

Crystallography of Zinnwaldite

Crystal System:
Monoclinic
Cell Parameters:
a = 5.29 Å, b = 9.14 Å, c = 10.09 Å
β = 100.83°
Ratio:
a:b:c = 0.579 : 1 : 1.104
Unit Cell Volume:
V 479.17 ų (Calculated from Unit Cell)
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 Zinnwaldite 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
AspidoliteNaMg3(AlSi3O10)(OH)2
BalestraiteKLi2V5+Si4O12
BiotiteA series or subgroup of the Mica Group.
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
GarmiteCsLiMg2(Si4O10)F2
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
LepidoliteA Li-rich mica in, or close to, the so-called Polylithionite-Trilithionite series.
LuanshiweiiteKLiAl1.50.5(Si3.5Al0.5)O10(OH,F)2
ManganiceladoniteKMgMn3+Si4O10(OH)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
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
PhengiteKAl2(AlSi3O10)(OH)2
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
UM1988-22-SiO:AlCaFFeHKLiMgKLiMgAl2Si3O10F2
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
9..Alumino-ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
9..Aluminobarroisite☐{CaNa}{Mg3Al2}(AlSi7O22)(OH)2
9..Alumino-magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
9..Aluminokatophorite{Na}{CaNa}{Fe42+Al}[(AlSi7)O22](OH)2
9..Aluminotschermakite☐{Ca2}{Mg3Al2}(Al2Si6O22)(OH)2
9..Alumino-ferrowinchite ☐{CaNa}{Fe42+Al}(Si8O22)(OH)2
9..Alumino-ferrobarroisite☐{CaNa}{Fe32+Al2}(AlSi7O22)(OH)2
9..Magnesiosadanagaite{Na}{Ca2}{Mg3Al2}(Al3Si5O22)(OH)2
9..ParaspurriteCa5(SiO4)2(CO3)
9..Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
9..HelviteMn42+(Be3Si3O12)S
9..Fluorthalénite-(Y)Y3(Si3O10)F
9..Gismondine
9..Ferriwhittakerite{Na}{Na1+xLi1-x}{Fe23+Mg2Li}(Si8O22)(OH)2
9..Ferri-ottoliniite◻{NaLi}{Mg3Fe23+}(Si8O22)(OH)2
9..IMA2007-015K[CaNa][Fe32+Al2][(OH)2|Al2Si6O22]
9..Sodicpedrizite
9..Sodic-ferropedrizite
9..IMA2008-041Na7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)
9..IMA2009-059BaKNaTi2(Si4O12)O2
9..IMA2009-082Ba2(Ca,Mg)(V3+,Al)2(Si4O10)(OH,F)2O(CO3)2
9..IMA2009-091{K}{Ca2}{Mg4Al}(Al2Si6O22)F2
17.2.1TopazAl2(SiO4)(F,OH)2
17.2.2PolylithioniteKLi2Al(Si4O10)(F,OH)2
17.2.3Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2
17.2.5Meliphanite(Ca,Na)2(Be,Al)[Si2O6(OH,F)]
17.2.6SarcoliteNa4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl)
17.2.7GötzeniteNaCa6Ti(Si2O7)2OF3
17.2.8Kuliokite-(Y)Y4Al(SiO4)2(OH)2F5
17.2.10MagbasiteKBaFe3+Mg7Si8O22(OH)2F6

Other Names for Zinnwaldite

Name in Other Languages:
German:Zinnwaldit
Simplified Chinese:铁锂云母
Spanish:Zinnwaldita
Traditional Chinese:鐵鋰雲母

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Zinnwaldite in petrology

Common component of (items highlighted in red)

References for Zinnwaldite

Reference List:
Haidinger, W. (1845), Handbuch der bestimmenden Mineralogie (Vienna): 521.

European Journal of Mineralogy (1996): 8: 1241.

Rieder, M. et al. (1998): Nomenclature of the Micas. The Canadian Mineralogist 36, 905-912.

Internet Links for Zinnwaldite

mindat.org URL:
https://www.mindat.org/min-4419.html
Please feel free to link to this page.
Specimens:
The following Zinnwaldite specimens are currently listed for sale on minfind.com.

Localities for Zinnwaldite

Mineral and/or Locality  
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