salammoniac

{{Infobox mineral | name = Salammoniac | category = Halide mineral | boxwidth = | boxbgcolor = | image = Salammoniac-456369.jpg | imagesize = | caption = Salammoniac crystals from a mine in Eisden, Maasmechelen, Limburg, Belgium (field of vision: 1.5 cm) | formula = NH4Cl | IMAsymbol = Sam | molweight = 53.49 g/mol | strunz = 3.AA.25 | system = Isometric | class = Hexoctahedral (mm) H-M symbol: (4/m 2/m) | symmetry = Pmm | unit cell = ; | color = Colorless, white, pale gray; may be pale yellow to brown, if impure. | habit = Crystals skeletal or dendritic; massive, encrustations | twinning = On {111} | cleavage = Imperfect on {111} | fracture = Conchoidal | tenacity = Sectile | mohs = 1–2 | luster = Vitreous | polish = | refractive = | opticalprop = Isotropic | birefringence = Weak after deformation | dispersion = | pleochroism = | fluorescence= No | absorption = No | streak = White | gravity = 1.535 | density = | melt = | fusibility = | diagnostic = | solubility = In water | diaphaneity = Transparent | other = | references = }} thumb|upright|Salammoniac crystal from Ravat Village, Tajikistan. One of many unusual salammoniac crystal specimens found in the area of Ravat Village, near [[Yaghnob River, where the crystals have grown in a feather-like or three-dimensional arborescent. Size: miniature, 3.3 × 1.4 × 1.4 cm]]

Salammoniac, also sal ammoniac or salmiac, is a rare naturally occurring mineral composed of ammonium chloride, NH4Cl. It forms colorless, white, or yellow-brown crystals in the isometric-hexoctahedral class. It has very poor cleavage and is brittle to conchoidal fracture. It is quite soft, with a Mohs hardness of 1.5 to 2, and it has a low specific gravity of 1.5. It is water-soluble. Salammoniac is also the archaic name for the chemical compound ammonium chloride.