Zinnwaldite
# Zinnwaldite

Zinnwaldite, $KLiFeAl(AlSi_3)O_{10}(OH,F)_2,$ potassium lithium iron aluminium silicate hydroxide fluoride is a silicate mineral in the mica group. The IMA status is as a series between siderophyllite $(KFe_2Al(Al_2Si_2)O_{10}(F,OH)_2)$ and polylithionite $(KLi_2AlSi_4O_{10}(F,OH)_2)$ and not considered a valid mineral species.

## Name and discovery

It was first described in 1845 in Zinnwald/Cinovec on the German-Czech Republic border.

## 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.

