Rambergite, the recently described Mn analogue of wurtzite, was found at Ro
nneburg, Thuringia, Germany. The mineral forms hexagonal crystals of up to
0.1 mm length. The cell parameters are a = 3.988(2) Angstrom, and c = 6.441
(4) Angstrom. Rambergite was formed by the reaction of H2S with Mn2+ ions.