Abstract
Two new minerals, versiliaite and apuanite, were found in the Buca della Vena mine on the Apuan Alps (Italy). The minerals generally occur as massive black aggregates in veinlets within layers of dolomite.
Versiliaite, , has space group Pbam or Pba2, a = 8.499(2), b = 8.326(2), c = 11.935(2)A, density 5.12 g cm-3. The strongest lines in the powder pattern are: 3.196(100), 3.167(97), 2.972(81), 2.682(40), 1.946(40), 1.652(33).
Apuanite, , has space group P42/mbc, a = 8.367(2), b = 17.959(6)A, density 5.33 g cm−3. The strongest lines in the powder pattern are 3.168(100), 2.957(43), 2.646(23), 2.434(17), 1.922(47), 1.647(30). The chemical, crystallographic, and structural data indicate a close relationship of the new minerals with schafarzikite.