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Molybdite
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Not to be confused with Molybdenite.
Molybdite is the naturally occurring mineral form of molybdenum trioxide MoO3. It occurs as yellow to greenish needles and crystallizes in the orthorhombic crystal system.
Quick Facts General, Category ...
Molybdite | |
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![]() Molybdite on molybdenite from the Questa Molybdenum Mine (size: 11.0 x 6.7 x 4.1 cm) | |
General | |
Category | Mineral |
Formula (repeating unit) | MoO3 |
IMA symbol | Myb[1] |
Strunz classification | 4.EA.10 |
Crystal system | Orthorhombic |
Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
Space group | Pbnm |
Unit cell | a = 3.96 Å, b = 13.85 Å, c = 3.69 Å; Z = 4 |
Identification | |
Color | Light greenish yellow to nearly colorless |
Crystal habit | Flattened needles or thin plates may occur in aggregates |
Cleavage | Perfect on {100}, district on {001} |
Tenacity | Flexible |
Mohs scale hardness | 3 - 4 |
Luster | Adamantine |
Streak | White |
Diaphaneity | Transparent |
Specific gravity | 4.72 |
Optical properties | Biaxial (+) |
Birefringence | High |
2V angle | Large |
References | [2][3][4][5] |
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