Vanadate minerals

Vanadate minerals

▪ Table
Vanadate minerals
name colour lustre Mohs hardness specific gravity
carnotite bright yellow to lemon or greenish yellow dull or earthy soft 4–5
descloizite brownish red to blackish brown; various shades from orange-red to black and green greasy 3–3½ 5.9–6.2
tyuyamunite canary yellow; lemon to greenish yellow waxy; also pearly about 2 variable with water content
vanadinite various shades of yellow, orange, red, and brown subresinous to subadamantine about 3 6.5–7.1
name habit or form fracture or cleavage refractive indices crystal system
carnotite powder of microscopic platy or lathlike crystals one perfect cleavage alpha = 1.750
beta = 1.925
gamma = 1.950 monoclinic
descloizite crusts of intergrown crystals; rounded fibrous masses no cleavage; uneven fracture desc mott
alpha = 2.18–2.21
beta = 2.25–2.31
gamma = 2.34–2.33 orthorhombic
tyuyamunite compact to cryptocrystalline massive; scales and lathlike crystals; radiating crystal aggregates one perfect, micalike cleavage orthorhombic
vanadinite hairlike or barrel-shaped (frequently hollow) prismatic crystals uneven to conchoidal fracture omega = 2.628–2.370
epsilon = 2.505–2.313 hexagonal
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Universalium. 2010.

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