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Zinnwaldite

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Formula:
KLiFe2+Al(AlSi3O10)(F,OH)2
System:
Monoclinic
Colour:
Greyish-brown, ...
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
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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)

Crystallography of Zinnwaldite

Crystal System:
Monoclinic
Cell Parameters:
a = 5.29Å, b = 9.14Å, c = 10.09Å
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.

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

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
Annite-Phlogopite Series
AspidoliteNaMg3(AlSi3O10)(OH)2
BalestraiteKLi2V5+Si4O12
Biotite
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
Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al,Fe3+)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
Lepidolite
LuanshiweiiteKLiAl1.5□0.5(Si3.5Al0.5)O10(OH,F)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
Muscovite-Celadonite Series
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
Phengite
PhlogopiteKMg3(AlSi3O10)(OH,F)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
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
9..Aluminotschermakite☐{Ca2}{Mg3Al2}(Al2Si6O22)(OH)2
9..Alumino-ferrowinchite
9..Alumino-ferrobarroisite☐{CaNa}{Fe32+Al2}(AlSi7O22)(OH)2
9..Magnesiosadanagaite{Na}{Ca2}{Mg3Al2}(Al3Si5O22)(OH)2
9..Paraspurrite
9..UviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
9..Helvite
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..IMA2008-041
9..IMA2009-059
9..IMA2009-082Ba2(Ca,Mg)(V3+,Al)2(Si4O10)(OH,F)2O(CO3)2
9..IMA2009-091
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)]
17.2.6SarcoliteNa2Ca12(Ca,K,Fe,Sr,Mg)2Al8Si12(P,Si)O52F2
17.2.7GötzeniteNa2Ca5Ti(Si2O7)2F4
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.

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

Specimens:
The following Zinnwaldite specimens are currently listed for sale on minfind.com.

Localities for Zinnwaldite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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