Alarsite
A variety of Minerals

What is Alarsite?
Alarsite (AlAsO4) is an aluminium arsenate mineral with its name derived from its composition: aluminium and arsenate. 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. It occurs in association with fedotovite, klyuchevskite, lammerite, nabokoite, atlasovite, langbeinite, hematite and tenorite.
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Alarsite Localities Map
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Quick Facts
Physical Properties
- Color
- Colorless, with pale tints of yellow, green, blue due to inclusions
- Hardness (Mohs)
- 5 - 5.5
- Density
- 3.32 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- AlAsO4
- Elements
- Al, As, O

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