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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The specimen photos, by about 25 people, are predictably excellent; many, of course, have been published before, but who can complain about seeing, all over again, such magnificent things as the 3.6-cm Oruro andorite/stannite on page 26; the 9.2-cm Tasna bismuthinite on page 45; the 3.1-cm spherical Llallagua vauxite on page 50; the thumbnail-size Colquechaca canfieldite on page 67; the surprising 8.2-cm Corocoro copper on page 79; the stunning cassiterites, ferberites, wavellites and apatites on several pages; and of course the great phosphophyl-lites, including Andy Seibel's breathtaking 5.2-cm matrix specimen on the front cover?
Then came the Kosnars' new vauxite specimens, about 15 fine thumbnails and miniatures found in October 2007 in the Siglo XX mine, Llallagua, Bolivia.
Also at the Main Show, Brian Kosnar of Mineral Classics (Minclassics@aol.com) was showing off a few matrix slabs--wide, thin pieces of matrix range from 5 to 30 cm across--of hard quartz porphyry thickly coated with powder-blue microcrystals of vauxite, together with sparser microcrystals of paravauxite and metavauxite.
Vaux (vauxite, metavauxite, paravauxite; nephew of William S.), Edgar T.
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.
It is the type locality for five mineral species (vauxite, metavauxite, paravauxite, sigloite and jeanbandyite) and has also produced some of the world's best specimens of stannite, cylindrite, monazite, bismoclite, and other species.
Pearly white to capucine-orange mammillary masses of resinous, amorphous allophane form the matrix in some vauxite, vivianite and wavellite specimens.
Brownish pink botryoidal micro-aggregates are also seen on some recent vauxite specimens.
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.