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| boxwidth =
| boxwidth =
| boxbgcolor =
| boxbgcolor =
| image = ZinnwalditeComplex lithium mica Custer Custer County South Dakota 1921.jpg
| image = Fluorapatite-Quartz-Topaz-gha5a.jpg
| imagesize =
| imagesize = 260px
| caption =
| caption = Fluorapatite with topaz on zinnwaldite and quartz
| formula = KLiFeAl(AlSi<sub>3</sub>)O<sub>10</sub>(OH,F)<sub>2</sub>
| formula = KLiFeAl(AlSi<sub>3</sub>)O<sub>10</sub>(OH,F)<sub>2</sub>
| IMAsymbol = Znw<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref>
⚫
| symmetry = Monoclinic ''Point Group:'' 2/m
⚫
| unit cell = a = 5.29 Å, b = 9.14 Å, c&nbsp;=&nbsp;10.09&nbsp;Å: β = 100.83°
| molweight =
| molweight =
⚫
| system = [[Monoclinic]]
| class = Prismatic (2/m) <br/><small>(same [[H-M symbol]])</small>
⚫
| symmetry = ''Cc'' (no. 9)
⚫
| unit cell = a = 5.29, b = 9.14 <br/>c = 10.09&nbsp;[Å]; β = 100.83°
| color = Gray-brown, yellow-brown, pale violet, dark green, color zoning common
| color = Gray-brown, yellow-brown, pale violet, dark green, color zoning common
| habit = Well-formed short prismatic or tabular crystals, pseudohexagonal, in rosettes or fan-shaped groups; lamellar or scaly aggregates; disseminated.
| habit = Well-formed short prismatic or tabular crystals, pseudohexagonal, in rosettes or fan-shaped groups; lamellar or scaly aggregates; disseminated.
⚫
| system = [[Monoclinic]] - Prismatic
| twinning = On composition plane {001}, twin axis [310]
| twinning = On composition plane {001}, twin axis [310]
| cleavage = Perfect basal {001}
| cleavage = Perfect basal {001}
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| solubility =
| solubility =
| diaphaneity = Transparent to translucent
| diaphaneity = Transparent to translucent
| references = <ref name=Handbook>http://rruff.geo.arizona.edu/doclib/hom/zinnwaldite.pdf Handbook of Mineralogy</ref><ref name-Webmin>http://webmineral.com/data/Zinnwaldite.shtml Webmineral data</ref><ref name=Mindat>http://mindat.org/min-4419.html Mindat</ref>
| references = <ref name=Handbook/><ref>[http://webmineral.com/data/Zinnwaldite.shtml Webmineral data]</ref><ref name=Mindat/><ref>{{cite journal |last1=Rieder |first1=M. |last2=Hybler |first2=J. |last3=Smrcok |first3=L. |last4=Weiss |first4=Z. |journal=European Journal of Mineralogy |volume=8 |year=1996 |pages=1241–1248 |title=Refinement of the crystal structure of zinnwaldite 2M_1 |issue=6 |doi=10.1127/ejm/8/6/1241}}</ref>
}}
}}
'''Zinnwaldite''', [[potassium|K]][[lithium|Li]][[iron|Fe]][[aluminium|Al]](Al[[silicon|Si]]<sub>3</sub>)[[oxygen|O]]<sub>10</sub>(O[[hydrogen|H]],[[fluorine|F]])<sub>2</sub>, is a potassium lithium iron aluminium silicate hydroxide fluoride [[silicate mineral]] in the [[mica]] group.
'''Zinnwaldite''', [[potassium|K]][[lithium|Li]][[iron|Fe]][[aluminium|Al]](Al[[silicon|Si]]<sub>3</sub>)[[oxygen|O]]<sub>10</sub>(O[[hydrogen|H]],[[fluorine|F]])<sub>2</sub>, potassium lithium iron aluminium silicate hydroxide fluoride is a [[silicate mineral]] in the [[mica]] group. The [[International Mineralogical Association|IMA]] status is as a series between [[siderophyllite]] (KFe<sub>2</sub>Al(Al<sub>2</sub>Si<sub>2</sub>)O<sub>10</sub>(F,OH)<sub>2</sub>) and [[polylithionite]] (KLi<sub>2</sub>AlSi<sub>4</sub>O<sub>10</sub>(F,OH)<sub>2</sub>) and not considered a valid mineral species.<ref name=Mindat/>


==Name and discovery==
==Name and discovery==
It was first described in 1845 in [[Zinnwald]]/[[Cinovec]] on the [[Germany|German]]-[[Czech Republic]] border.<ref name=Mindat/>
It was first described in 1845 in Zinnwald/Cinvald (today [[Cínovec]]) on the [[Germany|German]]-[[Czech Republic]] border.<ref name=Mindat>[http://mindat.org/min-4419.html Mindat]</ref>


==Occurrence==
==Occurrence==
It occurs in [[greisen]]s, [[pegmatite]], and [[quartz]] [[Vein (geology)|veins]] often associated with [[tin]] [[ore]] deposits. It is commonly associated with [[topaz]], [[cassiterite]], [[wolframite]], [[lepidolite]], [[spodumene]], [[beryl]], [[tourmaline]], and [[fluorite]].<ref name=Handbook/>
It occurs in [[greisen]]s, [[pegmatite]], and [[quartz]] [[Vein (geology)|veins]] often associated with [[tin]] [[ore]] deposits. It is commonly associated with [[topaz]], [[cassiterite]], [[wolframite]], [[lepidolite]], [[spodumene]], [[beryl]], [[tourmaline]], and [[fluorite]].<ref name=Handbook>[http://rruff.geo.arizona.edu/doclib/hom/zinnwaldite.pdf Handbook of Mineralogy]</ref>


==References==
==References==
{{Reflist}}
{{Reflist}}

{{Lithium compounds}}


[[Category:Potassium minerals]]
[[Category:Potassium minerals]]
[[Category:Iron minerals]]
[[Category:Iron(II) minerals]]
[[Category:Lithium minerals]]
[[Category:Lithium minerals]]
[[Category:Aluminium minerals]]
[[Category:Aluminium minerals]]
[[Category:Hydroxide minerals]]
[[Category:Monoclinic minerals]]
[[Category:Phyllosilicates]]
[[Category:Minerals in space group 9]]
[[Category:Halide minerals]]
[[Category:Mica group]]


{{silicate-mineral-stub}}
{{silicate-mineral-stub}}

[[ca:Zinnwaldita]]
[[es:Zinnwaldita]]
[[fr:Zinnwaldite]]
[[it:Zinnwaldite]]
[[he:צינוולדיט]]
[[nl:Zinnwaldiet]]
[[ja:チンワルド雲母]]
[[ru:Цинивальдит]]

Latest revision as of 10:27, 2 September 2024

Zinnwaldite
Fluorapatite with topaz on zinnwaldite and quartz
General
CategoryPhyllosilicate mineral
Formula
(repeating unit)		KLiFeAl(AlSi3)O10(OH,F)2
IMA symbolZnw[1]
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupCc (no. 9)
Unit cella = 5.29, b = 9.14
c = 10.09 [Å]; β = 100.83°
Identification
ColorGray-brown, yellow-brown, pale violet, dark green, color zoning common
Crystal habitWell-formed short prismatic or tabular crystals, pseudohexagonal, in rosettes or fan-shaped groups; lamellar or scaly aggregates; disseminated.
TwinningOn composition plane {001}, twin axis [310]
CleavagePerfect basal {001}
FractureUneven
TenacityLaminae °exible, elastic
Mohs scale hardness3.5 - 4.0
LusterPearly to vitreous
StreakWhite
DiaphaneityTransparent to translucent
Specific gravity2.9 - 3.1
Optical propertiesBiaxial (-)
Refractive indexnα = 1.565 - 1.625 nβ = 1.605 - 1.675 nγ = 1.605 - 1.675
Birefringence0.040 - 0.050
PleochroismDistinct, X = colorless to yellow-brown; Y = gray-brown; Z = colorless to gray-brown
2V angle0 - 40°
References[2][3][4][5]

Zinnwaldite, KLiFeAl(AlSi3)O10(OH,F)2, potassium lithium iron aluminium silicate hydroxide fluoride is a silicate mineral in the mica group. The IMA status is as a series between siderophyllite (KFe2Al(Al2Si2)O10(F,OH)2) and polylithionite (KLi2AlSi4O10(F,OH)2) and not considered a valid mineral species.[4]

Name and discovery

[edit]

It was first described in 1845 in Zinnwald/Cinvald (today Cínovec) on the German-Czech Republic border.[4]

Occurrence

[edit]

It occurs in greisens, pegmatite, and quartz veins often associated with tin ore deposits. It is commonly associated with topaz, cassiterite, wolframite, lepidolite, spodumene, beryl, tourmaline, and fluorite.[2]

References

[edit]
  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b Handbook of Mineralogy
  3. ^ Webmineral data
  4. ^ a b c Mindat
  5. ^ Rieder, M.; Hybler, J.; Smrcok, L.; Weiss, Z. (1996). "Refinement of the crystal structure of zinnwaldite 2M_1". European Journal of Mineralogy. 8 (6): 1241–1248. doi:10.1127/ejm/8/6/1241.
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