It is a sublimation product that forms with cryptohalite, sal ammoniac, and native sulfur. In nature, bararite appears with cryptohalite, sal ammoniac, and native sulfur. Visually, cryptohalite crystals are almost impossible to discern from sal ammoniac (NHCl). It occurs with native sulfur, sal ammoniac, letovicite, alunogen and boussingaultite. Evidence exists of use in the 13th century by alchemists as sal ammoniac. Treatments with ammonium chloride (sal ammoniac), cuprous chloride/hydrochloric acid, and ammonium sulfate are somewhat successful. Sal ammoniac is a name of the natural, mineralogical form of ammonium chloride. Sal ammoniac is also the archaic name for the chemical compound ammonium chloride. Salammoniac or sal ammoniac is a rare naturally occurring mineral composed of ammonium chloride, NHCl.