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Formula: Na2MoO4.2H2O
Valence: Na2Mo6+O4.2H2O
Hydrated molybdate
Crystal system: Orthorhombic
Specific gravity: 2.573 calculated
Hardness:
Streak: White
Colour: Colourless
Environments
Natromolybdite is a new mineral, approved in 2023 and to date (December 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, natromolybdite was found associated
with halite, sylvite,
aphthitalite, belomarinaite,
powellite, hematite,
sanidine, tilasite,
johillerite, bradaczekite,
badalovite, arsmirandite,
wrightite,
arsenatrotitanite,
dmisokolovite, litidionite,
rutile and cristobalite.
Natromolybdite occurs as rectangular, octagonal or rhomb-like lamellar to thin-tabular crystals up to 40 μm across
and up to 3 μm thick, in near-parallel, pile-like or rose-like aggregates and crystal crusts up to 0.2 mm across. It is
transparent and colourless, with a vitreous lustre
(MM 89.5.700-705).
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