| 词条 | Acuminite |
| 释义 |
| name = Acuminite | category = Halide mineral | formula = SrAlF4OH·(H2O) | 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 = [1][2][3] }} Acuminite is a rare halide mineral of with chemical formula: SrAlF4(OH)·(H2O). Its name comes from the Latin word acumen, meaning "spear point". Its Mohs scale rating is 3.5. Acumenite has only been described from its type locality of the cryolite deposit in Ivigtut, Greenland.[1] References{{Wiktionary}}1. ^1 Handbook of Mineralogy {{Halide-mineral-stub}}2. ^Mindat.org 3. ^Webmineral data 4 : Strontium minerals|Aluminium minerals|Fluorine minerals|Monoclinic minerals |
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