Tugarinovite
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 | |
|---|---|
| General | |
| Category | Oxide mineral |
| Formula (repeating unit) | MoO2 |
| Strunz classification | 4.DB.05 |
| Crystal system | Monoclinic |
| Space group | Monoclinic - prismatic H-M symbol (2/m) Space group: P 21/n |
| Unit cell | a = 5.6 Å, b = 4.85 Å, c = 5.53 Å; β = 119.37° |
| Identification | |
| Color | Dark lilac-brown |
| Crystal habit | Crystals are tabular striated prisms |
| Twinning | Polysynthetic |
| Mohs scale hardness | 4.6 |
| Luster | Greasy to metallic |
| Streak | Greenish gray |
| Diaphaneity | Semitransparent |
| Specific gravity | 6.58 (calculated) |
| Optical properties | Biaxial |
| Pleochroism | Light gray to dark pink; pale yellow to bluish olive-brown in reflected light |
| References | [1] [2][3] |
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]
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