Hechtsbergite, Bi<sub>2</sub>O(OH)(VO<sub>4</sub>), a new mineral from the Black Forrest, Germany
- Author(s)
- Werner Krause, Heinz-Jürgen Bernhardt, Günter Blaß, Herta Silvia Effenberger, Hans-Werner Graf
- Abstract
Hechtsbergite is assocd. with eulytite, namibite, chrysocolla, bismutite, beyerite, and mixite on samples from the Hechtsberg quarry near Hausach, Black Forest, Germany. The mineral forms aggregates and idiomorphic crystals up to a diam. of 0.2 mm. No distinct cleavage was obsd., the fracture is conchoidal and the Mohs' hardness is 4.5. Hechtsbergite has a brown color with an adamantine luster; the streak is yellow. The crystals are biaxial pos., 2V = 50(5)°, nx = 2.26(2), ny = 2.27 (calc.), nz = 2.30(2); X II b and Z L c .apprx. 35° (in the obtuse of beta). The most prominent crystallog. form of the monoclinic holohedral crystals is {111}; addnl. forms are {112}, {113}, {.hivin.101}, {.hivin.102}, and {.hivin.302}. Electron-microprobe investigations give Bi2O3 83.02, V2O5 15.18, As2O5 0.52, H2O (calc.) 1.59, sum 100.31 wt.-%. The empirical formula based on 6 oxygen atoms is Bi2.03O1.08(OH)1.01(VO4)0.95(AsO4)0.03, or idealized Bi2O(OH)(VO4). The 5 strongest lines of the powder diffraction pattern are [dhkl in .ANG., (Iobs) (hkl)]: 4.279 (41) (012), 3.267 (100+) (120, 20.hivin.2, 12.hivin.1, 112), 3.150 (63) (013), 2.734 (35) (211), 2.036 (29) (13.hivin.3, 23.hivin.1, 213, 033). Hechtsbergite has the space group P21/c, a = 6.791(1), b = 7.535(1), c = 10.881(1) .ANG., beta = 107.00(1)°, V = 546.6 .ANG.3, Z = 4, Dx = 6.87 g/cm3. As confirmed by the Rietveld refinement of the x-ray powder diffraction pattern, hechtsbergite is the vanadium analog of atelestite; for smrkovecite isotypy is taken for granted. The name is for the locality.
- Organisation(s)
- Department of Mineralogy and Crystallography
- External organisation(s)
- Ruhr-Universität Bochum (RUB)
- Journal
- Neues Jahrbuch für Mineralogie. Monatshefte
- Volume
- 1997
- Pages
- 271-287
- No. of pages
- 17
- ISSN
- 0028-3649
- Publication date
- 1997
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105113 Crystallography, 105116 Mineralogy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/30d01c78-dda2-494b-98bf-c1a585237fbd