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Zinnwaldite

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Formula:
KLiFe
2+
 
Al(AlSi
 
3
O
 
10
)(F,OH)
 
2
System:MonoclinicColour:Greyish-brown, ...
Hardness:2½ - 4
Member of:Mica Group
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:
KFe
2+
2
Al(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
-
KLi
 
2
Al(Si
 
4
O
 
10
)(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.

-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

IMA status:Discredited
Nickel-Strunz 10th (pending) edition ID:9..

9 : SILICATES (Germanates)
:
:
Dana 8th edition ID:71.2.2b.10

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
Hey's CIM Ref.:17.2.9

17 : Silicates Containing other Anions
2 : Silicates with fluoride
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Physical Properties of Zinnwaldite

Lustre: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 (measured):2.9 - 3.02 g/cm3
Density (calculated):2.831 g/cm3

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:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
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°
Maximum Birefringence:δ = 0.040 - 0.050

Chart 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:Mica Group
Other Members of Group:

- +
Aluminoceladonite
K(Mg,Fe
2+
 
)Al(Si
 
4
O
 
10
)(OH)
 
2
Anandite
(Ba,K)(Fe
2+
 
,Mg)
 
3
((Si,Al,Fe)
 
4
O
 
10
)(S,OH)
 
2
Annite
KFe
2+
3
(AlSi
 
3
O
 
10
)(OH)
 
2
Aspidolite
NaMg
 
3
(AlSi
 
3
O
 
10
)(OH)
 
2
Balestraite
KLi
 
2
V
5+
 
Si
 
4
O
 
12
Biotite
Bityite
LiCaAl
 
2
(AlBeSi
 
2
O
 
10
)(OH)
 
2
Boromuscovite
KAl
 
2
(BSi
 
3
O
 
10
)(OH)
 
2
Brammallite
(Na,H
 
3
O)(Al,Mg,Fe)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
Celadonite
K(Mg,Fe
2+
 
)Fe
3+
 
(Si
 
4
O
 
10
)(OH)
 
2
Chernykhite
(Ba,Na)(V
3+
 
,Al,Mg)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
Chromceladonite
K(Mg,Fe
2+
 
)(Cr,Al)(Si
 
4
O
 
10
)(OH)
 
2
Chromphyllite
K(Cr,Al)
 
2
(AlSi
 
3
O
 
10
)(OH,F)
 
2
Clintonite
Ca(Mg,Al)
 
3
(Al
 
3
SiO
 
10
)(OH)
 
2
Eastonite
KMg
 
2
Al(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Ephesite
LiNaAl
 
2
(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Ferro-aluminoceladonite
K(Fe
2+
 
,Mg)(Al,Fe
3+
 
)(Si
 
4
O
 
10
)(OH)
 
2
Ferroceladonite
K(Fe
2+
 
,Mg)(Fe
3+
 
,Al)(Si
 
4
O
 
10
)(OH)
 
2
Ferrokinoshitalite
(Ba,K)(Fe
2+
 
,Mg)
 
3
(Al
 
2
Si
 
2
O
 
10
)(OH,F)
 
2
Fluorannite
KFe
2+
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
Fluorophlogopite
KMg
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
Ganterite
(Ba,Na,K)(Al,Mg)
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
Glauconite
(K,Na)(Fe
3+
 
,Al,Mg)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
Hendricksite
K(Zn,Mg,Mn
2+
 
)
 
3
(AlSi
 
3
O
 
10
)(OH)
 
2
Illite
K
 
0.65
Al
 
2.0
[Al
 
0.65
Si
 
3.35
O
 
10
](OH)
 
2
Kinoshitalite
(Ba,K)(Mg,Mn
2+
 
,Al)
 
3
(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Lepidolite
Luanshiweiite
KLiAl
 
1.5
□0
 
.5
(Si
 
3.5
Al
 
0.5
)O
 
10
(OH,F)
 
2
Margarite
CaAl
 
2
(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Masutomilite
(K,Rb)(Li,Mn
3+
 
,Al)
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
Montdorite
(K,Na)
 
2
(Fe
2+
 
,Mn
2+
 
,Mg)
 
5
(Si
 
4
O
 
10
)
 
2
(OH,F)
 
4
Muscovite
KAl
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
Nanpingite
CsAl
 
2
(AlSi
 
3
O
 
10
)(OH,F)
 
2
Natro-glauconite
(Na,K)(Fe
3+
 
,Al,Mg)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
Norrishite
KLiMn
3+
2
(Si
 
4
O
 
10
)O
 
2
Oxykinoshitalite
(Ba,K)(Mg,Ti,Fe
3+
 
,Fe
2+
 
)
 
3
((Si,Al)
 
4
O
 
10
)(O,OH,F)
 
2
Oxyphlogopite
K(Mg,Ti,Fe)
 
3
[(Si,Al)
 
4
O
 
10
](O,F)
 
2
Paragonite
NaAl
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
Phengite
Phlogopite
KMg
 
3
(AlSi
 
3
O
 
10
)(OH,F)
 
2
Polylithionite
KLi
 
2
Al(Si
 
4
O
 
10
)(F,OH)
 
2
Preiswerkite
NaMg
 
2
Al(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Roscoelite
K(V
3+
 
,Al)
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
Shirokshinite
KNaMg
 
2
(Si
 
4
O
 
10
)F
 
2
Shirozulite
K(Mn
2+
 
,Mg)
 
3
(AlSi
 
3
O
 
10
)(OH)
 
2
Siderophyllite
KFe
2+
2
Al(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Sokolovaite
CsLi
 
2
Al(Si
 
4
O
 
10
)F
 
2
Suhailite
(NH
 
4
)Fe
2+
3
(AlSi
 
3
O
 
10
)(OH)
 
2
Tainiolite
KLiMg
 
2
(Si
 
4
O
 
10
)F
 
2
Tetraferriannite
KFe
2+
3
((Fe
3+
 
,Al)Si
 
3
O
 
10
)(OH)
 
2
Tetraferriphlogopite
KMg
 
3
(Fe
3+
 
Si
 
3
O
 
10
)(OH,F)
 
2
Tobelite
(NH
 
4
,K)Al
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
Trilithionite
K(Li,Al)
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
Voloshinite
Rb(LiAl
 
1.5
 
1.5
)(Al
 
0.5
Si
 
3.5
)O
 
10
F
 
2
Wonesite
(Na,K)(Mg,Fe,Al)
 
6
((Al,Si)
 
4
O
 
10
)
 
2
(OH,F)
 
4
Yangzhumingite
KMg
 
2.5
(Si
 
4
O
 
10
)F
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
9..Alumino-ferro-hornblende
☐{Ca
 
2
}{Fe
2+
4
Al}(AlSi
 
7
O
 
22
)(OH)
 
2
9..Aluminobarroisite
☐{CaNa}{Mg
 
3
Al
 
2
}(AlSi
 
7
O
 
22
)(OH)
 
2
9..Alumino-magnesio-hornblende
☐{Ca
 
2
}{Mg
 
4
Al}(AlSi
 
7
O
 
22
)(OH)
 
2
9..Aluminokatophorite
9..Aluminotschermakite
☐{Ca
 
2
}{Mg
 
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
9..Alumino-ferrowinchite
9..Alumino-ferrobarroisite
☐{CaNa}{Fe
2+
3
Al
 
2
}(AlSi
 
7
O
 
22
)(OH)
 
2
9..Magnesiosadanagaite
{Na}{Ca
 
2
}{Mg
 
3
Al
 
2
}(Al
 
3
Si
 
5
O
 
22
)(OH)
 
2
9..Paraspurrite
9..Uvite
Ca(Mg
 
3
)MgAl
 
5
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(F/OH)
9..Helvite
9..Gismondine
9..Ferriwhittakerite
{Na}{Na
 
1+x
Li
 
1-x
}{Fe
3+
2
Mg
 
2
Li}(Si
 
8
O
 
22
)(OH)
 
2
9..Ferri-ottoliniite
◻{NaLi}{Mg
 
3
Fe
3+
2
}(Si
 
8
O
 
22
)(OH)
 
2
9..IMA2007-015
K[CaNa][Fe
2+
3
Al
 
2
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
9..Sodicpedrizite
9..Sodic-ferropedrizite
9..IMA2008-041
9..IMA2009-059
9..IMA2009-082
Ba
 
2
(Ca,Mg)(V
3+
 
,Al)
 
2
(Si
 
4
O
 
10
)(OH,F)
 
2
O(CO
 
3
)
 
2
9..IMA2009-091
Related Minerals - Hey's Index Grouping:

- +
17.2.1Topaz
Al
 
2
(SiO
 
4
)(F,OH)
 
2
17.2.2Polylithionite
KLi
 
2
Al(Si
 
4
O
 
10
)(F,OH)
 
2
17.2.3Leifite
(Na,H
 
2
O)Na
 
6
[Be
 
2
Al
 
2
(Al,Si)Si
 
15
O
 
39
]F
 
2
17.2.5Meliphanite
(Ca,Na)
 
2
(Be,Al)[Si
 
2
O
 
6
(OH,F)]
17.2.6Sarcolite
Na
 
2
Ca
 
12
(Ca,K,Fe,Sr,Mg)
 
2
Al
 
8
Si
 
12
(P,Si)O
 
52
F
 
2
17.2.7Götzenite
Na
 
2
Ca
 
5
Ti(Si
 
2
O
 
7
)
 
2
F
 
4
17.2.8Kuliokite-(Y)
Y
 
4
Al(SiO
 
4
)
 
2
(OH)
 
2
F
 
5
17.2.10Magbasite
KBaFe
3+
 
Mg
 
7
Si
 
8
O
 
22
(OH)
 
2
F
 
6

Other Names for Zinnwaldite

Synonyms:
Lithioeisenglimmer
Other Languages:
German:Zinnwaldit
Russian:Циннвальдит
Simplified Chinese:铁锂云母
Spanish:Zinnwaldita
Traditional Chinese:鐵鋰雲母

Other Information

Health Warning: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.

Canadian Mineralogist (1998): 36: 905-912.

Internet Links for Zinnwaldite

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

    Localities for Zinnwaldite

    The 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.
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