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Formula: Al(AsO4)
Arsenate
Crystal System: Trigonal
Specific gravity: 3.32 calculated
Hardness: 5 to 5½
Streak: White
Colour: Colourless, with pale tints of yellow, green, blue due to inclusions
Luminescence: Not fluorescent under UV
Environments
Although alarsite was approved in 1993, to date (June 2023) it has been reported only from the
Tolbachik volcano.
Localities
At the type locality, the Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia, alarsite
occurs in fumeroles associated with fedotovite,
klyuchevskite, lammerite,
nabokoite, atlasovite,
langbeinite, hematite and
tenorite
(HOM).
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