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Chromium Pyroarsenate, Cr4(As2O7)3

Chromium Pyroarsenate, Cr4(As2O7)3, is produced when a small quantity of chromium sesquioxide is fused at a low temperature with sodium or potassium meta-arsenate. It yields green transparent prisms, sometimes elongated, sometimes flattened, with oblique extinctions; insoluble in dilute acids.

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