The dimorphic relation in Ag3SbS3 has not been well understood. In nature monoclinic pyrostilpnite is very rare, whereas rhombohedral pyrar-gyrite is described as an important and abundant ore of silver and formed at low temperatures (Palache et al., 1952). Miers (Palache et al., 1952), who first studied these two minerals, concluded that pyrargyrite and pyrostilpnite were always contemporaneous. Jensen (1947), in his study on the system Ag2S-Sb2S3, stated that “the compound 3Ag2S·Sb2S3 showed no heat effects below the melting point. This was unexpected, because this compound is formed in nature as two distinct mineral species, pyrargyrite and pyrostilpnite.”

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