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Formula: K2Al2O(AsO4)2
Valence: K2Al2O(As5+O4)2
Anhydrous arsenate
Crystal System: Orthorhombic
Specific gravity: 3.499 calculated
Streak: White
Colour: Colourless to light yellow
Environments
Wrightite is a relatively new mineral, approved in 2016 and to date (June 2026) reported only from the type
locality.
Localities
At the type locality, the second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field,
Milkovsky District, Kamchatka Krai, Russia, wrightite occurs as sublimates on
basaltic scoria near a
volcanic fumarole vent at a temperature of 500 to 6000°C. Associated minerals include
sylvite, ponomarevite,
piypite, dolerophanite,
euchlorine, lammerite,
johillerite, urusovite,
, filatovite,
hatertite, hematite,
ozerovaite and tenorite
(HOM).
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