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Brackebuschite
A valid IMA mineral species - grandfathered
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![Pb2Mn3+(VO4)2(OH)](#"/photo-443068.html"><img src="/image.pl?url=https%3a%2f%2fwww.mindat.org%2fimagecache%2f5e%2f93%2f02234920017271921777468.jpg&f=jpg&w=240" alt="02234920017271921777468.jpg" /></a><div><b>Luis Brackebusch</b></div></div></div><div><div><span>Formula:</span><div class=){kind=link}
Colour:
Dark brown to black; reddish brown in transmitted light.
Lustre:
Sub-Vitreous, Resinous, Sub-Metallic
Hardness:
4 - 5
Specific Gravity:
6.05
Crystal System:
Monoclinic
Member of:
Name:
Named by A. Döring in 1880 in honour of German mineralogist and geologist Ludwig Brackebusch (March 4, 1849, Northeim, Germany - June 2, 1906 Hannover, Germany), Professor of Mineralogy, University of Córdoba (1875-1888), Córdoba, Argentina, and author of several papers on Argentine minerals. He returned to Germany in 1888 and worked as a consulting geologist.
Brackebuschite Group. The Pb analogue oftokyoite, Mn analogue ofcalderónite, and Pb-Mn analogue ofgamagarite. Chemically similar tokrettnichite,paseroite, andpyrobelonite.
A rare secondary mineral occurring in the oxidized zones of hydrothermal Pb-Zn deposits.
Crystal structure details (Lafuente & Downs, 2016): (1)ccp set of O and Pb atoms; (2) chains of edge-sharing MnO6 octahedra, surrounded by 2 unique VO4 tetrahedra; (3)∞1[MnO4/2O2/1] chain connected sharing vertex with one vanadate group; (4) second vanadate group sharing two vertices with two octahedra, thus forming Mn2V ring; (5)∞1[Mn(VO4)2OH] chains, parallel to and twisted along [010]; (6) PbO8 and PbO11 polyhedra joining the previous chains; (7) one Pb and two Mn cations are bridged by OH group, which participates in a hydrogen bond with vanadate group of the adjacent chain.
A rare secondary mineral occurring in the oxidized zones of hydrothermal Pb-Zn deposits.
Crystal structure details (Lafuente & Downs, 2016): (1)ccp set of O and Pb atoms; (2) chains of edge-sharing MnO6 octahedra, surrounded by 2 unique VO4 tetrahedra; (3)∞1[MnO4/2O2/1] chain connected sharing vertex with one vanadate group; (4) second vanadate group sharing two vertices with two octahedra, thus forming Mn2V ring; (5)∞1[Mn(VO4)2OH] chains, parallel to and twisted along [010]; (6) PbO8 and PbO11 polyhedra joining the previous chains; (7) one Pb and two Mn cations are bridged by OH group, which participates in a hydrogen bond with vanadate group of the adjacent chain.