Formula: K2(Ca2Na)(SO4)3F
Crystal System: Orthorhombic
Specific gravity: 2.64 calculated for the empirical formula
Hardness: 3
Streak: White
Colour: Colourless
Luminescence: Non-fluorescent under UV or an electron beam
Common impurities:


Shuvalovite is a relatively new mineral, approved in 2014 and to date (December 2023) reported only from the type locality.


At the type locality, the Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia, the fumarole fields are still active; gas vents with temperatures up to 430oC are abundant at the summit of the cone. Almost ninety mineral species, mainly sulphates and arsenates, are found in Arsenatnaya.
Shuvalovite was found in a richly mineralised pocket in the Arsenatnaya fumarole, at the depth of 0.5 m below day surface. The temperature measured inside the pocket was 370 +/- 10oC. Walls of the pocket were covered by sublimate incrustations whose major minerals are hematite, tenorite, orthoclase, fluorophlogopite, langbeinite, aphthitalite, anhydrite, lammerite, johillerite and tilasite. Krasheninnikovite, euchlorine, alumoklyuchevskite, calciolangbeinite, vanthoffite, arcanite, wulffite, fluoborite, urusovite, svabite, paralammerite, bradaczekite, ericlaxmanite, kozyrevskite, popovite, alarsite, halite, copper-bearing gahnite, corundum, shuvalovite and fluorite are subordinate and rare constituents of this assemblage.
Shuvalovite is a fumarolic mineral formed at temperatures not lower than 360 to 380oC. It could have precipitated early, directly from the gaseous phase at higher temperatures, or it could have been formed through gas–rock interaction where basalt served as a source of metals, Ca in particular, whereas volatiles, SO3 and F (and possibly K and Na), originated from volcanic gas. The latter scenario seems more probable. Shuvalovite forms coarse lamellar to tabular, rectangular, octagonal or irregular crystals up to 0.05 x 0.7 x 0.9 mm32 in area overgrowing, together with calciolangbeinite and tenorite, the surface of basalt scoria sprinkled with small crystals of hematite, orthoclase and fluorophlogopite. Shuvalovite also occurs as imperfect, sometimes curved, pillow-like individuals occasionally overgrown by tiny distorted cubo-octahedra of fluorite (EJM 28.1.53-62).

Back to Minerals