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Alacranite from the type locality (Uzon caldera, Kamchatka, Russian Federation) was submitted for structural analysis. A single crystal was selected and the following lattice parameters were determined: a = 9.942(4), b = 9.601(2), c = 9.178(3) Å, β = 101.94(3)°, V = 857.1 (5) Å 3 . The crystal structure was solved in the P2/c space group using direct methods and refined to R = 6.79% for 472 observed reflections. The structure of alacranite consists of an ordered sequence of As 4 S 4  and As4S5 cage-like molecules, with a molecular packing closely resembling that found in the β-As 4 S 4  phase. Both As-As and As-S intramolecular distances are in the range usually observed for covalent bonds. The structural model confirms the chemical formula As 8 S 9  for alacranite, and accounts for differences in the unit-cell parameters of alacranite compared to those of the natural analogue of β-As 4 S 4 . This latter mineral, therefore, should receive a new name.

Alacranite, As 8 S 9 : structural study of the holotype and re-assignment of the original chemical formula