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The crystal structures of realgar, AsS and orpiment, AS 2 S 3  were refined using diffractometer data. The cell dimensions of realgar are:  a  = 9.325 ±.003 Å,  b  = 13.571 ± .005 Å,  c  = 6.587 ± .003 Å,  β  = 106° 23′  ± 5′, and those of orpiment are:  a  = 11.475 ± .005 Å,  b  = 9.577 ± .004 Å,  c  = 4.256 ± .002 Å,  β  = 90° 41′ ± 5′. In both cases the space group is  P 2 1 / n  ( C  2 h   5 ). A total of 1525 independent reflections were measured for realgar, and the final  R  factor was 0.045 (based on 1205 reflections). For orpiment 836 independent reflections were obtained, and the final  R  factor was 0.064 (based on 586 reflections).

Refinement of the crystal structures of realgar, AsS and orpiment, As 2 S 3 *