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CategoryOxide mineral
(repeating unit)
Strunz classification4.DB.05
Crystal systemMonoclinic
Space groupMonoclinic - prismatic H-M symbol (2/m) Space group: P 21/n
Unit cella = 5.6 Å, b = 4.85 Å, c = 5.53 Å; β = 119.37°
ColorDark lilac-brown
Crystal habitCrystals are tabular striated prisms
Mohs scale hardness4.6
LusterGreasy to metallic
StreakGreenish gray
Specific gravity6.58 (calculated)
Optical propertiesBiaxial
PleochroismLight gray to dark pink; pale yellow to bluish olive-brown in reflected light
References[1] [2][3]

Tugarinovite is a rare molybdenum oxide mineral with formula MoO2. It occurs as a primary mineral phase associated with metasomatism in a sulfur deficient reducing environment. In the type locality it occurs with uraninite, molybdenite, galena, zircon and wulfenite.[1]

Tugarinovite was first described for an occurrence in the Lenskoye molybdenum–uranium deposit in the Amurskaya Oblast, Far-Eastern Region, Russia. It was named for geochemist Ivan Alekseevich Tugarinov of the Vernadskii Institute in Moscow.[1][2] In addition to its type locality in Russia it has been reported from the Allende meteorite in Chihuahua, Mexico, the Nansei Archipelago of Japan and Bohemia in the Czech Republic.[2]