Koritnigit, Zn[H2O|HOAsO3], ein neues Mineral aus Tsumeb, Südwestafrika

Raman spectroscopy of hydrogen‐arsenate group (AsO3OH) in solid‐state compounds: cobalt mineral phase burgessite Co2(H2O)4[AsO3OH]2·H2O

“…[37] The infrared bands at 450 and 360 cm −1 were attributed to the δ antisymmetric (AsO 3 OH) 2− bending vibration (E); 580 cm −1 to the δ As-OH out-of-plane bending vibration; 715 cm −1 to the ν As-OH stretching vibration (A 1 ); 830 cm −1 to the ν antisymmetric (AsO 3 OH) 2− stretching vibration (E) and 1165 cm −1 to the δ As-OH in-plane bending vibration. [36] Keller et al [39] interpreted the infrared spectrum of koritnigite Zn(H 2 O)(AsO 3 OH) as follows: ν OH stretching vibrations 3480, 3200, 2770, 2420 and 2280 cm −1 ; δ H 2 O bending vibrations 1645 and 1560 cm −1 ; δ As-OH in-plane bending vibration 1300 cm −1 ; ν antisymmetric AsO 3 antisymmetric stretching vibration (E) 845 and 815 cm −1 ; ν As-OH stretching vibration (A 1 ) 760 cm −1 ; δ As-OH out-of-plane bending vibration (?) 650 cm −1 ; δ antisymmetric AsO 3 bending vibrations (E) 388 and 378 cm −1 ; δ AsO 3 bending vibration 320 cm −1 .…”

Hydrothermal Synthesis, Structure, and Characterization of a Mixed-Valent Iron(II/III) Phosphate, NaFe3.67(PO4)3: A New Variation of the Alluaudite Structure Type

“…There are several other examples in the literature of compounds whose structures are similar to the title phase with respect to the square-planar site, such as NaCu (AsO ) (11), AgCu (AsO ) (22), Cu Fe (PO ) (23), NaCo (AsO ) (24), and the mineral johillerite, Na(Mg,Zn) Cu(AsO ) (25). This square-planar site is normally unoccupied in alluaudite but has 2/3 occupancy in the title compound.…”

Raman spectroscopy of hydrogen arsenate group (AsO3OH)2− in solid‐state compounds: cobalt‐containing zinc arsenate mineral, koritnigite (Zn,Co)(AsO3OH)·H2O

“…Their ; these values are comparable with the data published for koritnigite. [7,11] . The koritnigite samples were quantitatively analysed for chemical composition by a Cameca SX 100 microprobe system in the wavelength dispersion mode.…”

“…[2 -6] The mineral phase koritnigite, Zn(AsO 3 OH)·H 2 O, was described as a rare mineral formed in the lower supergene zone of the famous base metal deposit Tsumeb, Namibia, in association with tennantite, cuprian adamite, stranskiite, lavendulan, köttigite, tsumcorite, prosperite and o'danielite. [7,8] Later, the Co-and Ni-rich variety of koritnigite was found at the Jáchymov ore district, Czech Republic, associated with erythrite, arsenolite and sphalerite. [9] The Co-dominant analogue of koritnigite, (Co, Zn)(AsO 3 OH)·H 2 O, mineral cobaltkortnigite was described as a weathering product of glaucodote or cobaltite, associated with erythrite-köttigite, sphaerocobaltite, pitticite, glaucodot, löllingite-safflorite, arsenopyrite and quartz (Schwarzenberg), as well as erythrite, cobaltite, calcite, barite and quartz (Bauhaus district, both Germany).…”

“…The AsO 3 OH tetrahedra form chains in the plane (0 1 0), parallel to the layer-packed octahedra. [11] Koritnigite from Tsumeb is colourless to white; [7] the Co and Ni variety of koritnigite from Jáchymov is rose with a purple tint; [9] and cobaltkoritnigite from Schwarzenberg is intense purple. [10] Data on the crystal structure of koritnigite may be obtained from the American Mineralogist data base at http://rruff.geo.arizona.edu/AMS/minerals/Koritnigite.…”