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Noun1.Zinnwaldite - a mica containing iron and lithiumzinnwaldite - a mica containing iron and lithium  
atomic number 3, Li, lithium - a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals
isinglass, mica - any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
References in periodicals archive ?
Petrological and geochemical characteristics of the Pleasant Ridge zinnwaldite topaz granite, southern New Brunswick, and comparisons with other topaz-bearing felsic rocks.
Other minerals containing significant F concentrations are topaz, lepidolite, zinnwaldite, and the mica group (Robinson and Edgington 1946).