Acuminite is a rare halide mineral with chemical formula: SrAlF4(OH)·(H2O). Its name comes from the Latin word acumen, meaning "spear point". Its Mohs scale rating is 3.5.
via Wikipedia infobox
{{infobox mineral | name = Acuminite | category = Halide mineral | formula = SrAlF4OH·(H2O) |IMAsymbol=Acu | strunz = 3.CC.10 | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = C2/c | unit cell = a = 13.223, b = 5.175 c = 14.251 [Å]; β = 11.61°; Z = 8 | color = White | habit = Clusters of acute dipyramidal Spearhead shaped crystals | twinning = Contact on {100} | cleavage = Perfect on {001} | luster = Vitreous | diaphaneity = Transparent | mohs = 3.5 | gravity = 3.295 | opticalprop = Biaxial (+) | refractive = nα = 1.451 nβ = 1.453 nγ = 1.462 - 1.463 | references = }} Acuminite is a rare halide mineral with chemical formula: SrAlF4(OH)·(H2O). Its name comes from the Latin word acumen, meaning "spear point". Its Mohs scale rating is 3.5.
Acuminite has only been described from its type locality of the cryolite deposit in Ivigtut, Greenland.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).