Paramendozavilite

paramendozavilite

mendozavilite

molybdenum

pegmatites

Images

Formula: NaAl₄Fe₇(PO₄)₅(PMo₁₂O₄₀)(OH)₁₆.56H₂O
Hydrated molybdate phosphate

Crystal System: Monoclinic
Specific gravity: 3.35 measured, 2.858 calculated
Hardness: 1
Streak: Very pale yellow
Colour: Pale yellow
Solubility: Easily soluble in dilute acids
Environments

Pegmatites

Localities

At the type locality, the San Judas Mine, Cumobabi, El Verde Mining District, Cumpas Municipality, Sonora, Mexico, paramendozavilite occurs in the bright yellow oxide zone, only in biotite-rich pegmatite gangue and is associated with a great number of secondary molybdenum minerals, among them mendozavilite, together with biotite and kaolinite.
The paramendozavilite forms abundant masses in the oxidised zone of the molybdenum-bearing pegmatitic breccia in granodiorite. Prismatic crystals have one perfect cleavage and polysynthetic twinning parallel to the cleavage plane. The mineral is pale yellow with a very pale yellow streak and vitreous lustre; it is soluble in hydrochloric, nitric and sulphuric acids even in dilute form at room temperature (AM 73.189-199, HOM)
Paramendozavilite from the San Judas Mine - Image

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