Ferriphoxite

ferriphoxite

carboferriphoxite

antipinite

aphthitalite

Images

Formula: [(NH₄)₂K(H₂O)][Fe³⁺(HPO₄)₂(C₂O₄)]
Organic compound, oxalate
Crystal system: Monoclinic
Specific gravity: 2.14 measured
Hardness: 2
Streak: White
Colour: Colourless
Luminescence: Does not fluoresce under long wave or short wave UV
Solubility: At room-temperature, insoluble in water, but easily soluble in dilute hydrochloric acid
Environments

Hydrothermal environments

Ferriphoxite is a new mineral, approved in 2024 and to date (July 2025) reported only from the type locality.

Localities

At the type locality, 125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA, ferriphoxite and carboferriphoxite occur with antipinite, aphthitalite, baryte, fluorite, hematite and quartz in an unusual bat-guano-related, post-mining assemblage. Ferriphoxite occurs as rectangular blades, up to ∼0.1 mm in length, typically forming sprays (MM 89.1.148-154).

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