Multiple oxide, forms a series with brannerite and with orthobrannerite, thorium- and titanium- bearing mineral.
Specific gravity: 5.82 measured, 6.08 calculated
Hardness: 4½ to 5½
Streak: Light brown
Colour: Black, dark brown
Plutonic igneous environments
At the type locality,the Severnyi area, Zardalek alkaline massif, Sokh Valley, Batken Region, Kyrgyzstan, thorutite occurs as short black prismatic crystals up to 2 cm in length and 0.5 to 1.0 cm in diameter. It is found in a syenite massif in veins of microcline and sericitised nepheline. Associated minerals are thorite, zircon, calcite, and a little baryte and galena (AM 43.1007).
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