...Andreas Ertl; M. Darby Dyar; John M. Hughes; Franz Brandstätter; Mickey E. Gunter; Markus Prem; Ronald C. Peterson Abstract Pertlikite, a new member of the voltaite group, is the tetragonal Mg-dominant analogue of the isometric phases voltaite and zincovoltaite. At its type locality, Madeni Zakh...

..., ammoniomagnesiovoltaite is structurally analogous to voltaite-group minerals; it is cubic, space group Fd 3̅ c , a = 27.260(2) Å, V = 20257(2) Å 3 , Z = 16. The new mineral is named for the dominant ammonium and magnesium in the composition and its membership in the voltaite group. § E-mail address : askszs@uni...

...Nikita V. Chukanov; Sergey M. Aksenov; Ramiza K. Rastsvetaeva; Gerhard Möhn; Vyacheslav S. Rusakov; Igor V. Pekov; Ricardo Scholz; Tatiana A. Eremina; Dmitriy I. Belakovskiy; Joachim A. Lorenz Abstract Magnesiovoltaite, a new voltaite-group mineral, was discovered in the Alcaparrosa mine, Cerro...

...Elena S. Zhitova; Oleg I. Siidra; Dmitry I. Belakovsky; Vladimir V. Shilovskikh; Anton A. Nuzhdaev; Rezeda M. Ismagilova Abstract Ammoniovoltaite, (NH 4 ) 2 Fe 2+ 5 Fe 3+ 3 Al(SO 4 ) 12 (H 2 O) 18 , is a new voltaite-group mineral. The mineral was discovered at the Severo-Kambalny (North-Kambalny...

.... Infrared spectroscopy confirmed the occurrence of minor NH 4 + also in voltaite. Its unit-cell parameter is a = 27.2635 Å, V = 20265(4) Å 3 , space group Fd 3 c . The crystal structure was refined down to R 1 = 0.0434 for 817 reflections with F o > 4σ( F o ) and 87 refined parameters. The partial...

... occurrence, other iron sulfates were identified, including alum-(K), “copiapite”, fibroferrite, halotrichite, melanterite, römerite, and voltaite. Volaschioite occurs as radial aggregates of bladed crystals, up to 100 μm in length and less than 5 μm across. The color is yellowish orange with an orange...

... with pyracmonite, tschermigite, and voltaite and occurs as colorless, pale pink, tan, and yellow hexagonal tablets. The streak is white. Crystals are transparent with vitreous luster. Mohs hardness is 2½, tenacity is brittle, fracture is irregular, and cleavage is perfect on {001}. The measured density is 2.65(2...

..., Italy. It occurs as colorless to pale pink tabular or short prismatic crystals up to 0.5 mm in size in association with alunogen, coquimbite, krausite, tamarugite, voltaite, pertlikite, yavapaiite, pickeringite and metavoltine. The mineral is trigonal, space group P 3̅1 c (no. 163), with a 10.7065(7), c...

... shown the presence of: (1) four minerals of the turquoise group: turquoise, faustite, chalcosiderite and planerite; (2) other phosphates from different groups: wavellite, crandallite, goyazite, gorceixite, variscite, metavariscite, fluorapatite; and (3) other minerals: voltaite, adularia and quartz...

...C. Osborne Hutton Abstract Yavapaiite, a new mineral from Jerome, Arizona, has the composition KFe 3+ (SO 4 ) 2 with two formula units in the unit cell. The mineral, associated with sulphur, voltaite, and other unidentified sulphates, forms pale pink, brittle, adamantine crystals, elongate parallel...

...Glenn B. Stracher; Anupma Prakash; Paul Schroeder; John McCormack; Xiangmin Zhang; Paul Van Dijk; Donald Blake Abstract Five unique mineral assemblages that include the sulfates millosevichite, alunogen, anhydrite, tschermigite, coquimbite, voltaite, and godovikovite, as well as the halide...

... studied here. Voltaite has one group of large doublets at δ = 0.44–0.54 mm/s and Δ = 0.35–0.40 mm/s, as well as a second group of smaller doublets at δ = 0.10–0.16 mm/s and Δ = 0.47–0.69 mm/s. All the samples studied here contained roughly equal distributions of Fe 2+ and Fe 3+ . Their spectra...

..., a rock sample in the Caltech Mineral Collection containing römerite alongside a halotrichite-group mineral, likely halotrichite or bilinite, and a black mineral, likely voltaite. These accessory minerals were identified based on their visual appearance (crystal habit and color) and known association...

... M. Peterson R.C. ( 2008 ) Pertlikite, a new tetragonal Mg-rich member of the voltaite group from Madeni Zakh, Iran . Canadian Mineralogist , 46 , 661 – 669 . Fanfani L. Nunzi A. Zanazzi P.F. ( 1970 ) The crystal structure of roemerite . American Mineralogist , 55...