Heating experiments show that natural deformed aggregates of sulfides (galena, sphalerite, chalcopyrite) anneal at rates that increase with temperature. The actual rates are affected by preferred orientation, included impurities, and possibly anisotropism. 'Two-phase aggregates also anneal and, for galena and sphalerite at least, thedihedral angle [angle developed by a crystal of one sulfide at its triple junction point with two grains of the other] decreases with increase in temperature.' The geologically very short time required for annealing at low temperature raises questions for interpretation of deformation textures.

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