Hydrated phosphate containing hydroxyl, laueite-paravauxite group
Specific gravity: 2.39 to 2.4
Colour: Sky-blue, dark blue, pale blue in transmitted light
Vauxite is a secondary mineral derived from the alteration of
apatite and associated with wavellite
At the type locality, the Siglo Veinte mine, Llallagua, Rafael Bustillo, Potosí, Bolivia, vauxite occurs in hydrothermal tin veins, associated with wavellite and paravauxite (HOM, Dana, Mindat), and also quartz, marcasite, metavauxite, allophane, crandallite and rarely cassiterite. Vauxite is the latest mineral to form in the sequence wavellite - metavauxite - paravauxite - vauxite (Minrec 37.2.155-156).
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