Cahnite

{{Short description|Mineral}} {{Infobox mineral | name = Cahnite | image = Cahnite-Rhodonite-245680.jpg | imagesize = 260px | alt = | caption = Cahnite on rhodonite | category = Borate minerals | formula = Ca2B[AsO4](OH)4 | IMAsymbol=Cah<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> | molweight = | strunz = 6.AC.70 | dana = | system = Tetragonal | class = Disphenoidal ({{overline|4}}) (same H-M symbol) | symmetry = ''I''{{overline|4}} | unit cell = | color = Colorless to white | colour = | habit = | twinning = | cleavage = Perfect On {110} | fracture = | tenacity = Brittle | mohs = 3 | luster = Vitreous | streak = | diaphaneity = Transparent | gravity = | density = 3.156 g/cm3 | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Cahnite Mineralienatlas]</ref> }} '''Cahnite''' ('''Cahnit''' in German, '''Cahnita''' in Spanish, '''Канит''' in Russian<ref name=min851>[http://www.mindat.org/min-851.html Mindat data sheet for Cahnite.]</ref>) is a brittle white or colorless mineral that has perfect cleavage and is usually transparent. It usually forms tetragonal-shaped crystals and it has a hardness of 3 mohs.<ref name=webmin>[https://www.webmineral.com/data/Cahnite.shtml Mineral Data sheet for Cahnite.]</ref><ref name=coll>{{Cite web |url=http://www.mineralcollecting.org/data/allcategory.cgi?a=Cahnite&m=ww&ex=&a=c&c=&d=&l=&h=&v=&s=&r=&el=&pc=&elt=&pct=&elr=&pcr=&elf=&pcf=&str=&dna=&fml= |title=Database entry from Mineral Collecting. |access-date=2008-05-19 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303192604/http://www.mineralcollecting.org/data/allcategory.cgi?a=Cahnite&m=ww&ex=&a=c&c=&d=&l=&h=&v=&s=&r=&el=&pc=&elt=&pct=&elr=&pcr=&elf=&pcf=&str=&dna=&fml= |url-status=dead }}</ref> Cahnite was discovered in the year 1921.<ref name=min851/> It was named Cahnite to honor Lazard Cahn (1865–1940), who was a mineral collector and dealer.<ref name=webmin/> It is usually found in the Franklin Mine, in Franklin, New Jersey,<ref name="coll" /><ref name="webmin" /> but has also been found in Japan<ref>[http://sciencelinks.jp/j-east/article/200219/000020021902A0418079.php Article stating that veins of cahnite were found in Okayama Prefecture.] {{webarchive|url=https://web.archive.org/web/20120217004059/http://sciencelinks.jp/j-east/article/200219/000020021902A0418079.php |date=2012-02-17 }}</ref> as well as in the Vallerano quarries in Rome, Italy.<ref>{{Cite web |title=Cahnite |url=https://www.mindat.org/min-851.html |access-date=2022-06-26 |website=www.mindat.org}}</ref> The geological environment that it occurs in is in pegmatites cutting a changed zinc orebody.<ref name="min851" /><ref name="webmin" /><ref name="coll" /> The chemical formula for cahnite is Ca2B[AsO4](OH)4.<ref name=coll/><ref>{{Cite web |url=http://database.iem.ac.ru/mincryst/s_carta.php?CAHNITE+695 |title=Database entry for Cahnite from Mincryst. |access-date=2008-05-19 |archive-date=2021-01-09 |archive-url=https://web.archive.org/web/20210109194027/http://database.iem.ac.ru/mincryst/s_carta.php?CAHNITE+695 |url-status=dead }}</ref><ref>[http://www.h5.dion.ne.jp/~nspicnic/mine/database/cahnitee.htm Database entry for Cahnite from Japanese database.]</ref> It is made up of 26.91% calcium, 3.63% boron, 25.15% arsenic, 1.35% hydrogen, and 42.96% oxygen. It has a molecular weight of 297.91 grams.<ref name=coll/> Cahnite is not radioactive.<ref name=webmin/> Cahnite is associated with these other minerals: willemite, rhodonite, pyrochroite, hedyphane, datolite, and baryte.<ref name=min851/>

==References== {{reflist}}

Category:Arsenate minerals Category:Calcium minerals Category:Borate minerals Category:Tetragonal minerals Category:Minerals in space group 82 Category:Minerals described in 1921