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The Collaborative International Dictionary
Zinnwaldite

Zinnwaldite \Zinn"wald*ite\, n. [So called after Zinnwald, in Bohemia, where it occurs.] (Min.) A kind of mica containing lithium, often associated with tin ore.

Wiktionary
zinnwaldite

n. (context mineralogy English) A mineral with monoclinic crystals, potassiumlithiumiron2+aluminum(Alsilicon3)oxygen10(fluorine,Ohydrogen)2, of the mica group.

WordNet
zinnwaldite

n. a mica containing iron and lithium

Wikipedia
Zinnwaldite

Zinnwaldite, K Li Fe Al(Al Si) O(O H, F), potassium lithium iron aluminium silicate hydroxide fluoride is a silicate mineral in the mica group. The IMA status is as a series between siderophyllite (KFeAl(AlSi)O(F,OH)) and polylithionite (KLiAlSiO(F,OH)) and not considered a valid mineral species.