...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...

..., 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...

... with coquimbite, and is also associated with ferrinatrite, krausite, pertlikite, pyrite, tamarugite and voltaite. It is a relatively early phase which forms during the oxidation of pyritic masses under increasingly arid conditions. Alcaparrosaite crystallizes from hyperacidic solutions in a chemical environment...

...) tetragonal, with space group I 4 1 / acd (pertlikite, see Ertl et al . 2008 ). In the case of pertlikite, the lowering of symmetry from isometric to tetragonal occurs as a result of cation ordering. This symmetry reduction is indicated by optical anisotropy (see Ertl et al . 2008 ). In the case...

...Fig. 4 The IR spectra of ( a ) magnesiovoltaite, ( b ) black voltaite with Fe 2+ :Mg ≈ 6:1 from the Alcaparrosa mine, and ( c ) dark olive green pertlikite from La Fossa crater, Vulcano island, Sicily, Italy. ...

... systematic investigation on minerals from this island, we found excellent samples of coquimbite near the sea shore at the so-called “Grotta dell’Allume” (Alum Grotto), associated with voltaite, pertlikite, krausite, yavapaiite, pickeringite, tamarugite and metavoltine. Preliminary investigation...

... 16 85679 0.16 0.69 9 0.43 0.36 40 1.30 1.79 32 1.19 1.75 19 95830 † 0.34 0.37 12 0.54 0.38 43 1.15 1.69 23 1.31 1.63 15 1.09 2.46 7 Pertlikite † pertlikite 0.42 0.36 72 1.30 1.70 13 1.18 1.65 12 Rhomboclase ML...