Ferrivauxite

ferrivauxite

sigloite

crandallite

vauxite

Images

Formula: Fe³⁺Al₂(PO₄)₂(OH)₃.5H₂O
Hydrated phosphate, forms oxidation pseudomorphs after vauxite
Crystal System: Triclinic
Specific gravity: 2.39 calculated for the empirical formula
Hardness: 3½
Streak: Pale yellow-brown
Colour: Golden brown
Environments

Hydrothermal environments

Ferrivauxite was approved in 2014 but to date (November 2025) it has been reported only from the type locality.

Localities

At the type locality, the Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia, ferrivauxite is formed by oxidation of primary fluorapatite and other phosphates in a hydrothermal tin deposit. Associated minerals include sigloite and crandallite (HOM).
Ferrivauxite from the Siglo Viente Mine - Image

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