Synthetic sinnerite has the composition Cu6As4S9; it is triclinic, space group P1, with cell dimensions a = 9.06 Å, b = 9.83 Å, c = 9.08 Å, α = 90°00’, β = 109°30’, γ = 107°48’ and a pronounced pseudocubic F-centered subcell (α = 5.25 Å). The crystals are twinned so that each composite prism contains six individuals twinned on the planes (010) and (110). The other twin laws, the twin plane (410) and threefold axis parallel to [001], are secondary and derived by a multiple application of the two primary ones.

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