cryptohalite

cryptohalite

[¦krip·tō′ha‚līt]
(mineralogy)
(NH4)2SiF6 A colorless to white or gray, isometric mineral consisting of ammonium silicon fluoride; occurs in massive and arborescent forms.
References in periodicals archive ?
Another classic locality in central Europe, the coal mines at Kladno, Bohemia, Czech Republic, last year yielded a brand-new surprise: the world's largest crystals of the very rare species cryptohalite, in about 40 specimens found last November on the mine dumps.

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