vauxite


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vauxite

[′vȯk‚sīt]
(mineralogy)
FeAl2(PO4)2(OH)2·7H2O A sky blue to Venetian blue, triclinic mineral consisting of a hydrated basic phosphate of iron and aluminum.
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1-cm spherical Llallagua vauxite on page 50; the thumbnail-size Colquechaca canfieldite on page 67; the surprising 8.
Then came the Kosnars' new vauxite specimens, about 15 fine thumbnails and miniatures found in October 2007 in the Siglo XX mine, Llallagua, Bolivia.
On some specimens, the blue vauxite forms casts after vanished spherical aggregates of wavellite to 8 mm diameter, and one specimen even shows metallic black microcrystals of franckeite.
I am told that specimens such as the type vauxite are crumbling, golds are missing and unaccounted for, the drawers and cabinets that the specimens are housed in are in serious disrepair and their deterioration is surely responsible for the damaged condition of so many of the specimens.
The allophane is unstable; unless kept under water it dehydrates to a chalky aggregate that gradually crumbles away, leaving thin crusts of blue vauxite with empty mammillary impressions on the bottom.
Brownish pink botryoidal micro-aggregates are also seen on some recent vauxite specimens.
Very rare melonjosephite was identified by X-ray diffraction as brown grains and brown-green aggregates on vauxite and under paravauxite from a rich vauxite-allophane pocket found in 2001-2002.
Included in the display were uncommon wurtzite, cylindrite, a colorful blue vauxite eight inches wide and a very fine fluorapatite.
the vauxite family minerals (for which it is the type locality), wolframite, vivianite, wurtzite, complexly twinned cassiterite, and Japan-law twinned quartz are well-represented as miniature to cabinet-sized specimens in both private and museum collections the world over.
1922) Preliminary notes on vauxite and paravauxite, two new minerals from Llallagua, Bolivia American Mineralogist, 7, 108.
Since colorful phosphates are characteristic of many oxide zones worldwide, it has been falsely assumed that the beautiful Bolivian phosphates like phosphophyllite, vivianite, ludlamite and vauxite are oxide zone minerals.
The supposed find from "Miraflores" (Huanuni Mine) was unique, and no vauxite associates (metavauxite, paravauxite, childrenite, etc.