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Formula: KTiO(AsO4)
Arsenate, titanium-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 3.49 calculated
Colour: Colourless
Common impurities: Fe(III)
Environments
Katiarsite is a relatively new mineral, approved in 2014 and to date (January 2025) reported only from the
type locality.
Localities
At the type locality, the Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption,
Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia, katiarsite occurs in sublimates
encrusting basaltic scoria
around a volcanic fumarole. Associated minerals include hatertite,
bradaczekite, johillerite,
yurmarinite, tilasite,
arsmirandite, hematite,
tenorite, arsenic-bearing
orthoclase,
fluorophlogopite and
aphthitalite. Katiarsite occurs as long prismatic to acicular,
typically sword-like, crystals up to 3 μm × 10 μm × 50 μm in size
(MM 80.4.639-646, HOM).
Katiarsite from the Arsenatnaya fumarole -
Image
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