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Formula:
[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]
Hydrated molybdate,
mendozavilite group,
betpakdalite supergroup
Crystal System: Monoclinic
Specific gravity: 3.85 measured, 2.948 calculated
Hardness: 1½
Streak: Bright yellow
Colour: Yellow, orange, brown
Luminescence: No fluorescence under UV
Solubility: Readily soluble in dilute hydrochloric, nitric and sulphuric acids at room-temperature.
Environments
Pegmatites
Hydrothermal environments
Mendozavilite-NaFe occurs in the oxidised zone of some
molybdenum-bearing hydrothermal mineral deposits
(HOM).
Localities
At the type locality:ⓘ San Judas Mine, Cumobabi, El Verde Mining District, Cumpas Municipality, Sonora, Mexico,
mendozavilite-NaFe occurs in the oxide zone of the
pegmatite
molybdenum deposit, as small (~20 µm) but well-formed crystals associated
with quartz and
paramendozavilite
(HOM, Mindat).
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