...Figure 12 Atomic arrangements of carlsonite and metavoltine, viewed down [100]. Fe 3+ O 6 octahedra are orange, Fe 2+ O 6 octahedra are green, SO 4 tetrahedra are yellow, K atoms are light blue spheres, Na atoms are dark blue spheres, N atoms are red spheres, O atoms of isolated H 2 O groups...

...Fig. 9. A structural fragment of szmolnokite ( а ), claster (FeO 6 ) 3 O(SO 4 ) 6 ( b ) in the structure of metavoltine, isolated hydrated octahedra (Fe +2 (H 2 O) 6 ) among the metavoltine clusters within its own structure ( c ). ...

... of light green–yellow equant crystals in a secondary assemblage with bobcookite, coquimbite, halotrichite, metavoltine, rhomboclase, römerite, tamarugite, voltaite and zincorietveldite. The streak is very pale green yellow and the fluorescence is strong green under 405 nm ultraviolet light. Crystals...

... with bobcookite, coquimbite, halotrichite, libbyite, metavoltine, rhomboclase, römerite, tamarugite and voltaite. The streak is very pale yellow. Crystals are transparent with vitreous lustre. The tenacity is brittle, the Mohs hardness is ~2½ and the fracture is curved. Cleavage is excellent on {010}, good...

... mineral occurring with alum-(K), halotrichite, metavoltine, quartz, römerite, stanleyite, sulphur, szomolnokite and mathesiusite. It forms rectangular blades flattened on {010} and elongated on [001], reaching ~0.3 mm in length. Crystals are yellow in colour, transparent with a vitreous lustre; the streak...

.... It is a secondary phase found on gypsum in association with copiapite, ferrinatrite, ivsite, metavoltine, and römerite. Seaborgite occurs in sprays of light-yellow, long flattened prisms or blades, up to about 0.2 mm in length. Crystals are elongated on [100], flattened on {010}, and exhibit the forms {100}, {010...

... in a secondary assemblage with belakovskiite, blödite, changoite, ferrinatrite, gypsum, ivsite, metavoltine and tamarugite. The streak is very pale yellow and the fluorescence is bright lime green under 405 nm ultraviolet light. Crystals are transparent with vitreous lustre. The tenacity is brittle, the Mohs...

... in a secondary assemblage with belakovskiite, ferrinatrite, halite, ivsite, metavoltine and thénardite. The streak is white and the fluorescence is bright cyan under 365 nm ultraviolet light. Crystals are transparent with vitreous lustre. The tenacity is brittle, the Mohs hardness is 2½, the fracture...

... Loa province, Antofagasta region, Chile. It is associated with römerite, coquimbite, metavoltine, tamarugite, halotrichite, szomolnokite, rhomboclase, and ferricopiapite. Calamaite forms acicular to hair-like crystals up to 0.01 × 2 mm combined in bunches or radial spherulitic clusters up to 4 mm...

... in association with blödite, ferrinatrite, kröhnkite, meisserite and metavoltine. Crystals of belakovskiite are very pale yellowish-green hair-like fibres up to 2 mm long and usually no more than a few μm in diameter. The fibres are elongated on [100] and slightly flattened on {021}. Crystals are transparent...

..., and hexahydrite, but other ammonium minerals (salammoniac, mascagnite, clairite, boussingaultite, efremovite, koktaite, mohrite, ammoniojarosite, godovikovite, letovicite) as well as native sulfur, millosevichite, alunogen, metavoltine, voltaite, gypsum, anhydrite, halotrichite, butlerite, jarosite, and copiapite...

..., 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...

..., Iran, the mineral occurs in a pyrite-bearing trachytic eruptive rock, and probably formed after the decomposition of pyrite. Pertlikite forms single crystals up to 1 cm; the phase is associated with metavoltine, botryogen, pyrite and alunite. In contrast to voltaite and zincovoltaite, the optical...

..., Sicily, Italy. The mineral occurs as sharp translucent crystals up to 0.25 mm in an altered pyroclastic breccia, together with alunite, sassolite, anhydrite and metavoltine. It is orthorhombic ( mmm ), space group Pbcn , with a 10.810(2), b 8.336(2), c 6.822(1) Å, V 614.8(2) Å 3 , Z = 4; the crystal...