Achyrophanite

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Achyrophanite
General
Category Minerals
Formula (K,Na)3(Fe3+,Ti,Al,Mg)5O2(AsO4)5
IMA symbol Aph
Strunz classification 8.BF.30
Crystal system Orthorhombic
Identification
ColorStraw-yellow to golden yellow
Cleavage Perfect (001)
Fracture Irregular/Uneven
Tenacity Brittle
Luster Vitreous
Streak White
Specific gravity 3.814
Density 3.814 g/cm3
References https://www.mindat.org/min-52919.html

Achyrophanite ((K,Na)3(Fe3+,Ti,Al,Mg)5O2(AsO4)5) is a yellow mineral, discovered in 2018 and described in 2025. [1]

Its name comes from the Greek words άχυρον (straw) and φαίνομαι (to appear), hinting at its straw like appearance.

Its type locality is the Tolbachik Volcano in Kamchatka, Russia. [2]

References

  1. ↑ "Achyrophanite". Mindat. Retrieved 2025-07-29.
  2. ↑ Pekov, Igor V.; Zubkova, Natalia V.; Koshlyakova, Natalia N.; Belakovskiy, Dmitry I.; Vigasina, Marina F.; Agakhanov, Atali A.; Britvin, Sergey N.; Turchkova, Anna G.; Sidorov, Evgeny G.; Zhegunov, Pavel S.; Pushcharovsky, Dmitry Yu. (2025-07-02). "Achyrophanite, (K,Na)3(Fe3+,Ti,Al,Mg)5O2(AsO4)5, a New Mineral with the Novel Structure Type from Fumarolic Exhalations of the Tolbachik Volcano, Kamchatka, Russia". Minerals. 15 (7): 706. doi: 10.3390/min15070706 . ISSN   2075-163X.
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