...Nikita V. Chukanov; Oleg I. Siidra; Yury S. Polekhovsky; Igor V. Pekov; Dmitry A. Varlamov; Vera N. Ermolaeva; Alla A. Virus The new lead oxychloride vanadate mineral erikjonssonite was discovered at the abandoned Kombat copper mine, Grootfontein district, Namibia, in association with hausmannite...

..., 70176 Stuttgart, Germany 2019 milanriederite new mineral vesuvianite group crystal structure Mössbauer Kombat mine Namibia Fig. 3 Mössbauer spectrum of milanriederite. Seven spot analyses were carried out using a digital scanning electron microscope Tescan VEGA-II XMU...

...Nikita V. Chukanov; Diana O. Nekrasova; Oleg I. Siidra; Yury S. Polekhovsky; Igor V. Pekov Abstract The new mineral janchevite was discovered in Mn-oxide ore from the Kombat mine, Grootfontein district, Otjozondjupa region, Namibia. Associated minerals are baryte, hausmannite, calcite, magnesite...

... of the Kombat mine. Grootfonteinite is named after the locality in the Grootfontein district. The mineral forms platy grains up to 1 mm across and up to 0.2 mm thick included in and intergrown with massive cerussite. Grootfonteinite is colourless, with white streak and adamantine lustre. It is brittle...

...Robert T. Downs; William W. Pinch; Richard M. Thompson; Stanley H. Evans; Lauren Megaw Abstract A new chain-silicate mineral species, yangite, ideally PbMnSi 3 O 8 ·H 2 O, has been found on a specimen from the Kombat mine, Otavi Valley, Namibia. Associated minerals are melanotekite...

...Frank C. Hawthorne; Yassir A. Abdu; Neil A. Ball; William W. Pinch Abstract Carlfrancisite, Mn 3 2+ (Mn 2+ ,Mg,Fe 3+ ,Al) 42 (As 3+ O 3 ) 2 (As 5+ O 4 ) 4 [(Si,As 5+ )O 4 ] 6 [(As 5+ ,Si)O 4 ] 2 (OH) 42 , is a new mineral from the Kombat mine, Otavi Valley, Namibia, and occurs as curved platy...

..., damaraite, kombatite, sahlinite, copper, quartz, barysilite, Mn silicates and a number of Mn oxyhydroxide minerals on a specimen from the Kombat mine in Namibia. The minerals formed as late-stage products of hydrothermal reworking of primary sulfide minerals. Hereroite is monoclinic, C 2/ c with a = 23.14(1...

...Pete J. Dunn; Carl A. Francis; Robert A. Ramik; Joseph A. Nelen; John Innes Abstract Wiserite, a very rare manganese borate, has been found at the Kombat mine, Namibia, associated with hausmannite, alleghanyite, and pyrobelonite on the hanging-wall side of a 2-m-thick lens of manganeseo xide ore...

... . Optical properties include uniaxial (+); ω = 1.596(2), ε = 1.604(2). Jaffeite occurs at the Kombat mine, Namibia, in a low-grade metamorphic setting, with major defemite and hausmannite, and minor brucite, hillebrandite, vesuvianite, glaucochroite, apatite, galena, and native copper. * Contribution...

...Pete J. Dunn; Carl A. Francis; John Innes Abstract A mcgovernite-like mineral from the Kombat mine, Namibia, occurs with alleghanyite, calcite, and ribbeite. It has the approximate formula (Mn,Mg,Fe 3+ ) 273 As ˜12 3+ As ˜30 5+ Si ˜42 O 324 -(OH) 252 . It is hexagonal, R 3 2/ c or R 3 c...

...Donald R. Peacor; Halil Sarp; Pete J. Dunn; John Innes; Joseph A. Nelen Abstract Discovery of well-crystallized defemite occurring in platy crystals up to 1 cm in diameter in the Kombat mine, Namibia, has led to improved physical and chemical data and refinement of the composition. Crystal...

...Donald R. Peacor; Eric J. Essene; Roland C. Rouse; Pete J. Dunn; Joseph A. Nelen; Joel D. Grice; John Innes; Oleg Von Knorring Abstract Holdawayite is a new mineral occurring at the Kombat mine, Namibia. The chemical analysis is MgO 4.4, MnO 64.6, CaO 0.5, FeO 0.2, B 2 O 3 1.2, CO 2 14.2, H 2 O...

...Roland C. Rouse; Donald R. Peacor; Pete J. Dunn; Alan J. Criddle; Chris J. Stanley; John Innes Abstract Asisite, ideally Pb 7 SiO 8 Cl 2 , is a new species from the Kombat mine in South West Africa (Namibia). Its unit cell is tetragonal, I 4/ mmm , with a = 3.897(2), c = 22.81(2) Å, and Z = 1...

...Donald R. Peacor; Pete J. Dunn; Shu-Chun Su; John L. Innes Abstract Ribbeite, Mn 5 (OH) 2 (SiO 4 ) 2 , is a new mineral from the Kombat mine in Namibia. It is orthorhombic with space group Pbnm or Pbn 2 1 and with lattice parameters a = 4.799(1), b = 10.742(6), c = 15.70(1) Å, Z = 4. Chemical...

...Giovanni O. Lepore; Luca Bindi; Francesco d'Acapito; Anna-Irene Landi; Paola Bonazzi Abstract The crystal structure of the rare mineral janchevite was solved using intensity data collected from a twinned crystal from the Kombat mine, Namibia. This study revealed that, in spite of the strong...

... as a sakhaite-like mineral from the Kombat Mine, Tsumeb. The Si:B ratios of the samples ranged from that of end-member sakhaite (containing B only) to that of end-member harkerite (Si:B = 1:1), with several intermediate compositions. All samples were deficient in B relative to the ideal composition, implying...

... , from the Kombat mine, Otavi Valley, Namibia, and mcgovernite, ideally Zn 3 (Mn 2+ ,Mg,Fe 3+ ,Al) 42 (As 3+ O 3 ) 2 (As 5+ O 4 ) 4 [(Si,As 5+ )O 4 ] 8 (OH) 42 , hexagonal (rhombohedral), R 3̄ m with Z = 6, and unit-cell parameters: a = 8.2061(3), c = 204.118(8) Å and V = 11903.8(6) Å 3 , from Sterling...

...Oleg I. Siidra; Sergey V. Krivovichev; Rick W. Turner; Mike S. Rumsey; John Spratt Abstract The crystal structure of hereroite, a new complex lead oxychloride mineral from the Kombat Mine, Grootfontein, Namibia, has been solved by direct methods and refined to R 1 = 0.054 for 6931 unique observed...

...Oleg I. Siidra; Sergey V. Krivovichev; Rick W. Turner; Mike S. Rumsey; John Spratt Abstract The crystal structure of vladkrivovichevite, a new complex lead oxychloride mineral from the Kombat Mine, Grootfontein, Namibia, has been solved by direct methods and refined to R 1 = 0.048 for 3801 unique...

...}}.\] \end{document} The unit cell of turtmannite is similar to those of mcgovernite, a Mn-Mg-Zn arsenate from Sterling Hill, New Jersey, and an unnamed “mcgovernite-like” Mn-Mg arsenate from the Kombat Mine, Namibia. The crystal structure of turtmannite is close to the model predicted for mcgovernite...