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Formula: NaTiO(AsO4)
Arsenate, tilasite group,
titanium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.950 calculated
Hardness: 5½
Streak: White
Colour: Brownish red, pale pinkish-reddish, almost colourless
Environments
Arsenatrotitanite is a relatively new mineral, approved in 2016 and to date (July 2023) 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, arsenatrotitanite was found associated
with orthoclase, tenorite,
hematite, johillerite,
bradaczekite, badalovite,
calciojohillerite,
arsmirandite, tilasite,
svabite, cassiterite,
pseudobrookite, rutile,
sylvite, halite,
aphthitalite, langbeinite
and anhydrite.
Arsenatrotitanite occurs as prismatic, tabular, lamellar or acicular crystals up to 0.3 × 0.8 × 2
mm3. They are separated or combined in open-work aggregates up to 2 mm across or interrupted crusts up to
2 × 5 mm2Arsenatrotitanite is transparent, brownish red to pale
pinkish-reddish or almost colourless, with vitreous lustre
(MM 83.3.453-458).
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