American Mineralogist, Volume 101, pages 748–751, 2016 New Mineral Names*,† FERNANDO CÁMARA1 AND DMITRIY BELAKOVSKIY2 1Dipartimento di Scienze della Terra, Università di degli Studi di Torino, Via Valperga Caluso, 35-10125 Torino, Italy 2Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18 korp. 2, Moscow 119071, Russia IN THIS ISSUE This New Mineral Names has entries for 6 new minerals, including kaliochalcite, magnesiorow- landite-(Y), mapiquiroite, mieite-(Y), nicksobolevite, and okruschite. KALIOCHALCITE* at 492w, 439w, 374. Average electron probe WDS analyses is I.V. Pekov, O.I. Siidra, N.V. Chukanov, V.O. Yapaskurt, D.I. [wt% (range)]: Na2O 0.04 (0.00–0.14), K2O 11.01 (10.43–11.29), Belakovskiy, M.N. Murashko and E.G. Sidorov (2014) Ka- CaO 0.27 (0.00–0.67), FeO 0.15 (0.08–0.28), CuO 40.28 (39.35–40.61), ZnO 0.39 (0.00–1.49), SO3 40.97 (40.06–42.28), liochalcite, KCu2(SO4)2[(OH)(H2O)], a new tsumcorite-group mineral from the Tolbachik volcano, Kamchatka, Russia. H2O 5.84 (by selective sorption from the gaseous products of European Journal of Mineralogy, 26, 597–604. heating), total 98.95. The empirical formula, calculated on the basis of 10 O apfu, is: (K0.94Ca0.02Na0.01)Σ0.97(Cu2.03Zn0.02Fe0.01)Σ2.06 S2.05O8.20(OH)1.01(H2O)0.79. The X-ray powder data was collected Kaliochalcite (IMA 2013-037), ideally KCu2(SO4)2[(OH) using Gandolfi method. The strongest lines of the X-ray powder (H2O)], is a new mineral found as a product of the interactions involving the high-temperature, sublimate KCu-sulfates and diffraction pattern [d (Å) (I%; hkl)] are: 6.78 (100; 001), 4.93 (28; atmospheric water vapor at temperatures <100–150 °C, in 110), 3.484 (70; 202), 3.249 (63; 112), 2.892 (77; 201), 2.852 several fumaroles at the Second scoria cone of the Northern (83; 021), 2.554 (72; 312,221), 2.326 (44; 222), and 1.693 (37; Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik 423,224). The unit-cell parameters refined from powder data are: volcano, Kamchatka, Russia. It occurs as the major component a = 8.933(3), b = 6.255(1), c = 7.607(3) Å , β = 117.29(3)°, V = 3 of polymineralic fine-grained green crusts 0.5 cm thick, where 377.8 Å . X-ray single-crystal diffraction study [refined to R1 = it pseudomorphoses euchlorine, fedotovite, or piypite. It is as- 0.101 for 389 unique F > 4σ(F) reflections] on a crystal fragment sociated to hematite, tenorite, langbeinite, aphthitalite, steklite, 5 × 5 × 90 μm shows the mineral is monoclinic, space group lammerite, chlorothionite, and gypsum. The mineral forms C2/m; with unit-cell parameters a = 8.935(2), b = 6.2520(18), c = pseudo-rombohedral crystals up to 0.03 × 0.10 in cavities. Ka- 7.602(2) Å, β = 117.32° (calculated, not reported by the authors), 3 liochalcite is light green to bright grass-green, with pale green to V = 377.29 Å ; Z = 2. Kaliochalcite is named as the potassium white streak. It is transparent with vitreous luster in individuals (kalium, in Latin) analog of natrochalcite, NaCu2(SO4)2[(OH) and translucent and dull in aggregates. It is brittle with uneven (H2O)] and is a new member of the tsumcorite group. While kalio- fracture. Mohs hardness is 4 and cleavage or parting were not chalcite is almost Na-free, the intermediate K-Na compound has observed, the fracture is uneven. Density could not be measured been synthesized and therefore it is expected to observed solid because of paucity of pure and massive material as particles more solution between natrochalcite and kaliochalcite. The holotype specimen is deposited in the Fersman Mineralogical Museum than 0.05 mm in size, even monomineralic, are porous. Dcalc = 3.49 g/cm3. Kaliochalcite is optically biaxial (+), α = 1.630(3), of the Russian Academy of Sciences, Moscow, Russia. F.C. β = 1.650(3), γ = 1.714(3) (589 nm), 2V = 55(10)°, 2V = meas calc MAGNESIOROWLANDITE-(Y)* AND MIEITE-(Y)* 60°. Dispersion of optical axes is strong, r < v. In transmitted light kaliochalcite is colorless to pale green, with a very weak S. Matsubara, R. Miyawaki, K. Yokoyama, M. Shigeoka, K. pleochroism. The IR spectrum shows absorption bands (cm–1; s = Momma and S. Yamamoto (2014) Magnesiorowlandite-(Y), strong band, w = weak band, sh = shoulder) related to OH– groups Y4(Mg,Fe)(Si2O7)2F2, a new mineral in a pegmatite at Souri Valley, Komono, Mie Prefecture, Central Japan. Journal of and H2O molecules as O–H-stretching vibrations at 3370sh, – Mineralogical and Petrological Sciences, 109, 109–117. 3334, to trace amounts of HSO4 groups as O–H-stretching vibra- R. Miyawaki, S. Matsubara, K. Yokoyama, M. Shigeoka, tions at 2044w, H2O molecules as bending vibrations at 1623, 2– K. Momma and S. Yamamoto (2015), Mieite-(Y), Y4(Ti) SO4 groups as asymmetric stretching vibrations 1224s, 1061s, symmetric stretching vibrations at 998s, and bending vibrations (SiO4)2O[(F,(OH)]6, a new mineral in a pegmatite at Souri at 655, 621, 599, Cu∙∙∙OH as bending vibrations at 914, and lat- Valley, Komono, Mie Prefecture, Central Japan. Journal 2– of Mineralogical and Petrological Sciences, 110, 135–144. tice modes involving Cu–O and bending mode of SO4 groups * All minerals marked with an asterisk have been approved by the IMA CNMMC. † For a complete listing of all IMA-validated unnamed minerals and their codes, Two new minerals, magnesiorowlandite-(Y) (IMA 2012-010), see http://pubsites.uws.edu.au/ima-cnmnc/. ideally Y4(Mg,Fe)(Si2O7)2F2, a Mg-analog of rowlandite-(Y) and 0003-004X/16/0003–748$05.00/DOI: http://dx.doi.org/10.2138/am-2016-NMN101317 748 NEW MINERAL NAMES 749 mieite-(Y) (IMA 2014-020), Y4Ti(SiO4)2O[(F,(OH)]6, were found axial (optical sign not given) with α = 1.694(2) and γ = 1.715(5) and together in a loose pegmatite block from Souri Valley, Komono, with anomalous blue interference colors. The FTIR spectrum ex- Mie Prefecture, Central Japan. The upper zone of the valley is hibits an absorption bands at (cm−1): 3400 (O–H stretching), broad developed by the Cretaceous granite with numerous pegmatites bands 900–1100 (Si–O, Ti–O, and Al–O bonds); weak absorption composed of quartz, albite, K-feldspar, muscovite, allanite-(Ce), band at 1650 cm–1 (H–O–H bending) may be due to absorbed wa- and gadolinite-(Y). In one of the pegmatite blocks a large crystal ter. The average of 7 electron probe WDS analysis [wt% (range)] of thalenite-(Y) was found. The type specimens of magnesiorow- is SiO2 14.70 (14.60–14.79), P2O5 1.06 (0.95–1.10), TiO2 5.32 landite-(Y) and mieite-(Y) were deposited in the National Museum (5.14–5.57), Al2O3 2.84 (2.66–2.94), Fe2O3 0.06 (0.04–0.09), Y2O3 of Nature and Science, Japan. 45.14 (44.04–45.83), La2O3 n.d., Ce2O3 0.39 (0.26–0.56), Pr2O3 0.10 Magnesiorowlandite-(Y) occurs as aggregates up to 1 cm (0–0.49), Nd2O3 1.62 (1.51–1.68), Sm2O3 1.59 (1.15–1.79), Gd2O3 scattered in the pegmatite and composed of gray massive and 3.99 (3.76–4.11), Tb2O3 0.73 (0.50–0.85), Dy2O3 4.70 (4.22–4.93), white powdery components. It is gray to white with a white Ho2O3 0.65 (0.52–0.77), Er2O3 1.73 (1.55–1.94), Tm2O3 0.39 streak, vitreous to oily luster and uneven fracture. No cleavage (0.21–0.62), Yb2O3 2.13 (2.01–2.25), Lu2O3 0.77 (0.54–0.95), was observed. The Mohs hardness is 5–5½. The density was not ThO2 1.59, UO2 0.63 (0.55–0.68), F 9.28 (8.89–9.63), –O=F2 3.91, 3 measured due to small grain size; Dcalc = 4.82 g/cm . The mineral H2O (by structure) 2.19, total 97.69. The empirical formula based is biaxial (–), α = 1.755 (5), γ = 1.760 (5), with no pleochroism. on the sum of 7 cations and 9 O atoms pfu is (Y3.13Dy0.20Gd0.17 The average of 16 electron probe WDS analysis [wt% (range)] Yb0.08Nd0.08Sm0.07Er0.07Th0.05Tb0.03Ho0.03Lu0.03Ce0.02Tm0.02U0.02)Σ4.00 is SiO2 28.61 (27.98–29.91), FeO 2.94 (2.60–3.19), MnO (Ti0.52Al0.44Fe0.01)Σ0.97(Si1.92P0.12)Σ2.04O9[F3.83(OH)1.91]Σ5.74. The min- 0.35 (0.26–0.40), MgO 2.77 (2.55–2.88), CaO 0.03 (0–0.08), eral is significantly metamictic. The strongest lines of the X-ray Y2O3 36.02 (34.06–38.54), La2O3 0.29 (0.07–0.55), Ce2O3 2.64 powder diffraction pattern obtained for material recrystallized by (1.36–3.57), Pr2O3 0.64 (0.25–0.96), Nd2O3 4.72 (3.20–5.62), annealing at 810° C (time not given) [d(Å) (I%; hkl)] are: 2.68 Sm2O3 2.82 (2.28–3.20), Gd2O3 4.45 (4.04–4.92), Tb2O3 0.69 (100; 331), 3.76 (85; 400), 3.54 (83; 002), 3.48 (82; 130), 2.16 (78; (0.51–0.93), Dy2O3 4.87 (4.51–5.35), Ho2O3 0.50 (0–0.89), 023), 4.26 (68; 021), 5.46 (58; 111).