Zinnwaldite n. : A kind of mica containing lithium, often associated with tin ore.

Example:
What are some common things that the mineral Zinnwaldite is used for?

Taxonomy
Zinnwaldite, free encyclopedia, search, Phyllosilicate mineral, O10, Light brown, Micaceous, masses, pseudo, phenocryst, tablets, composition, plane, twin, axis, basal, Tenacity, Laminae.

Defination from the web:
Zinnwaldite, K Li Fe Al(AlSi 3)O 10(OH,F)2, is a potassium lithium iron aluminium silicate hydroxide fluoride silicate mineral in the mica group. ... Retrieved from "http://en.wikipedia.org/wiki/Zinnwaldite" ...