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The new mineral tschortnerite, ideally Ca 4 (K,Ca,Sr,Ba) 3 Cu 3 (0H) 8 [Si 12 Al 12 0 4S ]·ϰH 2 0, ϰ &gt; 20, occurs as well-formed cubes up to a maximum size of 0.15 mm in a Ca-rich xenolith at the Bellberg volcano near Mayen, Eifel, Germany. The light blue, transparent crystals are optically isotropic, n = 1.504(2). Microprobe analysis (in weight percent) gave CaO 13.10, CuO 9.64, SrO 4.49, BaO 1.93, K 2 O 1.37, Fe 2 O 3  0.30, Al 2 O 3  25.21, SiO 2  30.25, H 2 O (calc, by difference) 13.71. The empirical formula based on 48 O atoms within the tetrahedral net is Ca 5.60 Sr 1.04 K 0.70 Ba 0.30 Cu 2.90 Fe 0.09 Al 11.85 Si 12.06 O 48 (OH) 8.44· 14.01H 2 O. Tschörtnerite is cubic, space group Fm3̅m [a = 31.62(1) Å, V = 31614 Å 3 , Z = 16]. The density is -D meas  = 2.1 g/cm 3 , D calc  = 2.10 g/cm 3 . Single-crystal X-ray investigations showed that tschortnerite is a zeolite; the structure contains interconnection of double six-rings, double eight-rings, sodalite cages, truncated cubo-octahedra, and previously unknown 96-membered cages (tschörtnerite cage). A new structural unit is the [Cu 12 (OH) 2 JCa 8 O 24 (H 2 O) 8  cluster centered within the truncated cubo-octahedron. The cluster is formed by a rhomb- dodecahedron-like arrangement of comer connected CuO 4  squares, the eight CaO 7  poly- hedra are branched. The sodalite cage houses Ca 4 (OH) 4 O 12  clusters of edge-sharing CaO 6  octahedra. Half-occupied (K,Ca,Sr,Ba) positions were located in the basal and top face of the double eight-rings, i.e., the border to the tschortnerite cage. Within the large tschort­nerite cage only H 2 O molecules were localized.

Tschörtnerite, a copper-bearing zeolite from the Bellberg volcano, Eifel, Germany