Ammonium chloride (also Sal Ammoniac, salmiac, nushadir salt, sal armagnac, sal armoniac, salt armoniack) is, in its pure form, a clear white water-soluble crystalline of . The aqueous ammonium chloride solution is mildly acidic. is a name of natural, mineralogical form of ammonium chloride. The mineral is especially common on burning dumps (formed by condensation of coal-derived gases), but also on some volcanoes