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Alarsite
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Alarsite : ウィキペディア英語版
Alarsite
Alarsite (AlAsO4) is an aluminium arsenate mineral with its name derived from its composition: aluminium and arsenate.〔(Handbook of Mineralogy )〕 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 nω = 1.596 and nε = 1.608.
It was reported from fumaroles in the Tolbachik volcano, Kamchatka, Far Eastern Region, Russia.〔(Fact sheet from Mindat.org )〕〔(Fact sheet from Webmineral.com )〕 It occurs in association with fedotovite, klyuchevskite, lammerite, nabokoite, atlasovite, langbeinite, hematite and tenorite.〔
== References ==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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