{{Infobox mineral | name= Alarsite | boxwidth = | boxbgcolor = | image = Alarsite.jpg | imagesize = | alt = | caption = Alarsite crystals found at Tolbachik | category = | formula = |IMAsymbol=Ars<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 = | dana = | system = trigonal | class = aluminium arsenate | symmetry = ''P3<sub>1</sub>21'' (no. 152) or ''P3<sub>2</sub>21'' (no. 154) | unit cell = | color = | colour = colorless with pale yellow tints | habit = | twinning = | cleavage = | fracture = | tenacity = | toughness = | mohs = 5-5.5 | luster = vitreous luster | streak = | diaphaneity = | gravity = 3.32. | density = | polish = | opticalprop = | refractive = nω = 1.596 and nε = 1.608. | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = }}
'''Alarsite''' (AlAsO<sub>4</sub>) is an aluminium arsenate mineral with its name derived from its composition: aluminium and arsenate.<ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/alarsite.pdf Handbook of Mineralogy]</ref> It occurs as brittle subhedral grains which exhibit trigonal symmetry. It has a Mohs hardness of 5-5.5 and a specific gravity of 3.32. It is semitransparent, colorless with pale yellow tints and shows a vitreous luster. It is optically uniaxial (+) with refractive indices of n<sub>ω</sub> = 1.596 and n<sub>ε</sub> = 1.608.
It was reported from fumaroles in the Tolbachik volcano, Kamchatka, Far Eastern Region, Russia.<ref>[http://www.mindat.org/min-94.html Fact sheet from Mindat.org]</ref><ref>[http://www.webmineral.com/data/Alarsite.shtml Fact sheet from Webmineral.com]</ref> It occurs in association with fedotovite, klyuchevskite, lammerite, nabokoite, atlasovite, langbeinite, hematite and tenorite.<ref name=HBM/>
== References == {{Reflist}}
Category:Arsenate minerals Category:Aluminium minerals Category:Trigonal minerals Category:Minerals in space group 152 or 154 Category:Geology of Russia
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