Trivalent arsenic minerals

A wide variety of minerals was observed however, this discussion will emphasize the mode of occurrence of the As-bearing phases both trivalent and pentavalent arsenic minerals were observed. 

Arsenite A mineral, compound or aqueous species containing As033, where the valence state of the arsenic is trivalent (As(III)). Arsenite is often abbreviated As(III) in the literature, especially in documents dealing with arsenic treatment. The inorganic arsenious acid species, H3ASO30, is the most common dissolved form of arsenite in near pH neutral aqueous solutions (compare with arsenate and thioarsenite). 

Actinide phosphates and some actinide vanadates and arsenates crystallize in several stractural modifications NaTh2(P04)3, monazite, zircon, scheelite, NaZr2(P04)3 (NZP), and enlytine (Table 1). The monazite and NZP stractnre types are presented by the orthophosphates containing both trivalent and tetravalent actinides. In most cases, the above mentioned stractnre types are leahzed in natural minerals that have synthetic analogues with general formula Mm(X04)n where X = Si, P, W (Table 1). The most... 

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