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Zinnwaldite

Phyllosilicate mineral series in the trioctahedral mica group From Wikipedia, the free encyclopedia

Zinnwaldite
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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]

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Name and discovery

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

Occurrence

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

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