On roscoelite

Hillebrand, W. F.; Turner, H. W.

doi:10.2475/ajs.s4-7.42.451

Cited by 2 publications

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“…Roscoelite is the best described vanadium clay (Hillebrand et aL, 1899;Wells and Brannock, 1946;Heinrich and Levinson, 1955). Roscoelite has a 2:1 mica structure, with V 3+ as the major octahedral cation (Maylotte et al, 1981;Foster, 1959).…”

Section: Introductionmentioning

confidence: 99%

The Composition and Origin of Vanadium-Rich Clay Minerals in Colorado Plateau Jurassic Sandstones

Meunier

1994

Clays and clay miner.

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Abstract--The composition and origin of vanadium-bearing clay minerals in the Jurassic (Morrison and Entrada Formations) sandstones of the Colorado Plateau are reassessed using microanalyses (microprobe and scanning electron microscope). The main V-clays are authigenic illite and chlorite of various petrologic habits: clay casts and matrix, pore lining, replacement of detrital grains. The chemical composition of the V-clays is similar in three different localities in the Morrison Formation separated by about 50 kin, suggesting that the V-clays are the result of a large regional event. In both illite and chlorite, A1 and V are inversely correlated, showing that V replaces AI in the octahedral position. The chlorite contains a complex mixture of divalent and trivalent cations that cannot fit within a sudoite structure. A classification of V-micas is proposed that employs V3+/sum of the octahedral cations vs. the sum of the interlayer charges. V-illite and roscoelite from the Colorado Plateau are characteristic of diagenetic/hydrothermal environments. For a given locality the composition of the V-clays does not vary with habit, showing that these minerals formed at thermodynamic equilibrium.

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Section: Introductionmentioning

confidence: 99%