Abstract

Soft sulfide grains occurring in rigid rock may be pseudomorphs, although possessing rectilinear, seemingly idiomorphic or excellent crystallographic form. Sulfide spheres of uniform dimensions and of different composition may be pseudomorphous after pyrite spheres without other visible replacement evidence. Grains of ragged outline and of "atoll form" intergrowths may be pseudomorphs even if connecting veinlets of the disunited grains are indiscernible.

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