Letovicite () is an ammonium sulfate mineral with composition (NH4)3H(SO4)2 (IUPAC: triammonium sulfate hydrogensulfate, Nickel–Strunz classification 07.AD.20).
{{Infobox mineral | name = Letovicite | category = Sulfate mineral | image = Letovicite.jpg | imagesize = | alt = | caption = White crystals of ammonium sulfate mineral letovicite from the Anna 2 Mine, Aachen, North Rhine – Westphalia, Germany. | formula = (NH4)3H(SO4)2 | IMAsymbol = Let | molweight = | strunz = 07.AD.20 | dana = 28.1.3.1 | system = Monoclinic | class = Prismatic (2/m) | symmetry = C2/c (no. 15) | unit cell = | color = Colorless, white | habit = Tiny pseudo-hexagonal plates, granular | twinning = Lamellar twinning | cleavage = Distinct on {001} | fracture = Uneven | tenacity = | mohs = 1–2 | luster = | refractive = | opticalprop = Biaxial (−), colorless (transmitted light) | birefringence = | 2V = 75° (calc.) | pleochroism = | streak = | gravity = 1.83 | density = | melt = | fusibility = | diagnostic = | solubility = Soluble in water | diaphaneity = Transparent | other = | references = }}
Letovicite () is an ammonium sulfate mineral with composition (NH4)3H(SO4)2 (IUPAC: triammonium sulfate hydrogensulfate, Nickel–Strunz classification 07.AD.20).
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).