Triazolite, NaCu2(N3O2H2)(2)(NH3)(2)Cl(3 center dot)4H(2)O, a new mineral species containing 1,2,4-triazolate anion, from a guano deposit at Pabellon de Pica, Iquique Province, Chile

摘要

The new mineral triazolite is found in a guano deposit located on the Pabellon de Pica Mountain, Iquique Province, Tarapaca Region, Chile. Associated minerals are salammoniac, halite, dittmarite, joanneumite, chanabayaite, nitratine, natroxalate and mohnite. Triazolite occurs as deep blue prismatic crystals up to 0.1 mm x 0.15 mm x 0.75 mm and their radial aggregates up to 1.5 mm across. The mineral is brittle. Its Mohs hardness is 2. D-calc = 2.028 g cm(3). The infrared spectrum shows the presence of 1,2,4-triazolate anion and ammonia and water molecules. Triazolite is optically biaxial (-), alpha = 1.582(4), beta = 1.625(3), gamma = 1.625(3) and 2V(meas) = 5(3)degrees. The chemical composition (electron-microprobe data for Cl, Na, Fe and Cu; H, C, N and S contents were measured by gas chromatography of products of ignition at 1200 degrees C; wt.%) is: Na 4.91, Fe 1.51, Cu 22.06, Cl 19.80, S 1.4, C 7.7, H 4.4, N 24.2, O (calc.) 12.83, total 98.81. The empirical formula is Na-1.14(Cu1.86Fe0.14)(Cl2.99S0.23)N9.23C3.43H23.34O4.29. The idealized formula is NaCu2(N3C2H2)(2)(NH3)(2)Cl-3 center dot 4H(2)O. Triazolite is a metalorganic ammine complex in which 1,2,4-triazolate anion and ammonia molecule are ligands coordinating Cu2+. The crystal structure was solved by direct methods and refined to R = 0.0242 based on 4210 unique reflections with I 2 sigma(I). Triazolite is orthorhombic, space group P2(1)2(1)2(1), a = 19.3575(5), b = 7.15718(19), c = 12.5020(4) , V = 1732.09(8) (3) and Z = 4. The eight strongest reflections of the powder X-ray diffraction pattern [d, (I,%) (hkl)] are: 10.22 (97) (101), 6.135 (40) (011), 5.696 (17) (301), 5.182 (59) (202), 5.119 (100) (211), 4.854 (19) (400), 3.752 (16) (312, 501), 3.294 (18) (221). Triazolite is named for the presence of 1,2,4-triamlate anion.