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N'Chwaning II Mine

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Journal Article
Published: 01 October 2012
European Journal of Mineralogy (2012) 24 (6): 991–1004.
...Cristian Biagioni; Elena Bonaccorsi; Stefano Merlino; Danilo Bersani; Claudia Forte Abstract X-ray diffraction studies of “tobermorite 10 Å”, obtained through heating of the “anomalous” tobermorite 11 Å from N’Chwaning II mine (Kalahari Manganese Field, RSA), show the widespread structural disorder...
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Journal Article
Published: 01 October 2012
European Journal of Mineralogy (2012) 24 (6): 981–989.
... differ in their behaviour upon heating, which can be “normal” if they collapse to form a 9 Å phase or “anomalous” if they preserve their original basal spacing. The “anomalous” thermal behaviour of tobermorite 11 Å from N’Chwaning II mine (Kalahari Manganese Field, Republic of South Africa), which does...
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Bunch of lath-shaped crystals of oyelite. <span class="search-highlight">N’Chwaning</span> <span class="search-highlight">II</span> <span class="search-highlight">mine</span>, Kalahari, Sou...
Published: 01 May 2019
Fig. 2 Bunch of lath-shaped crystals of oyelite. N’Chwaning II mine, Kalahari, South Africa. Scanning electron microscope secondary-electron image.
Journal Article
Published: 01 April 2015
Mineralogical Magazine (2015) 79 (2): 485–495.
... y Si 6– y )O 15+2 x – y ·5H 2 O. Its endmember compositions correspond to tobermorite Ca 5 Si 6 O 17 ·5H 2 O ( x = 1 and y = 0) and the new species kenotobermorite, Ca 4 Si 6 O 15 (OH) 2 ·5H 2 O ( x = 0 and y = 0). The type locality of kenotobermorite is the N'Chwaning II mine, Kalahari Manganese...
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Journal Article
Published: 01 April 2007
Mineralogical Magazine (2007) 71 (2): 193–201.
...P. Bonazzi; L. Bindi; O. Medenbach; R. Pagano; G. I. Lampronti; S. Menchetti Abstract Olmiite, ideally CaMn[SiO 3 (OH)](OH), is a newly identified mineral from the N’Chwaning II mine of the Kalahari manganese fields (Republic of South Africa), which occurs as a product of hydrothermal alteration...
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Journal Article
Published: 01 January 2001
American Mineralogist (2001) 86 (1-2): 147–158.
... ) VIII (Mn 1.95 Fe 0.01 Al 0.04 ) VI [SiO 4 ] 2.07 [H 4 O 4 ] 0.93 from the N’Chwaning II mine at the Kalahari manganese fields, Republic of South Africa, has been studied by single-crystal X-ray diffraction at 100 and 293 K at ambient pressure and up to 8.7 GPa in a diamond-anvil cell at 293 K...
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Journal Article
Published: 01 December 2000
South African Journal of Geology (2000) 103 (3-4): 231–236.
...B. Cairncross; H. Tsikos; C. Harris Abstract Prehnite is described herein from the N’Chwaning II mine, Kalahari manganese field for the first time. The habit and composition are atypical for the species. The mineral occurs as elongated, prismatic orthorhombic yellow-orange crystals arranged...
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Journal Article
Published: 01 March 2000
American Mineralogist (2000) 85 (3-4): 563–569.
... vesuvianite, a = 15.487(2), c = 11.764(2) Å from the N’chwaning II mine of the Kalahari manganese fields (RSA). This untwinned crystal has Cu 2+ and Mn 2+ , Mn 3+ forming the square pyramid and exhibits an acentric ordering pattern with 85% string A and 15% string B. This is compared to a reinvestigation...
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Journal Article
Published: 01 March 2000
American Mineralogist (2000) 85 (3-4): 570–577.
...Thomas Armbruster; Edwin Gnos Abstract Strongly zoned Mn-rich vesuvianites with MnO concentrations up to 14.3 wt% from the N’chwaning II mine of the Kalahari manganese field (South Africa) crystallized at hydrothermal conditions below 450 °C. These vesuvianites are by far the most Mn-rich samples...
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Infrared absorption spectra of powdered oyelite samples from Bazhenovskoe d...
Published: 01 May 2019
Fig. 3 Infrared absorption spectra of powdered oyelite samples from Bazhenovskoe deposit (a) and N’Chwaning II mine (b).
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Scanning electron microscope secondary electron image of elongated prismati...
Published: 01 December 2000
Figure 3. Scanning electron microscope secondary electron image of elongated prismatic prehnite crystals arranged in parallel groups from N’Chwaning II mine.
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Polarized optical absorption single-crystal spectra of the close to end-mem...
Published: 01 April 2004
F ig . 2. Polarized optical absorption single-crystal spectra of the close to end-member henritermierite (sample #97) from the N’Chwaning II mine. Positions ν 1 –ν 4 indicate band peaks and shoulders. The absorber thickness was 19 μm.
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Comparison between the X-ray powder diffraction patterns (a), and micro-Ram...
Published: 01 October 2012
Fig. 11 Comparison between the X-ray powder diffraction patterns (a), and micro-Raman spectra (b), of tobermorite 10 Å and oyelite from N’Chwaning II mine. The micro-Raman spectra were collected in the same crystallographic orientation, i.e. with the polarization direction parallel
Journal Article
Published: 01 May 2019
European Journal of Mineralogy (2019) 31 (3): 595–608.
...Fig. 2 Bunch of lath-shaped crystals of oyelite. N’Chwaning II mine, Kalahari, South Africa. Scanning electron microscope secondary-electron image. ...
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Journal Article
Published: 01 April 2004
Mineralogical Magazine (2004) 68 (2): 335–341.
...F ig . 2. Polarized optical absorption single-crystal spectra of the close to end-member henritermierite (sample #97) from the N’Chwaning II mine. Positions ν 1 –ν 4 indicate band peaks and shoulders. The absorber thickness was 19 μm. ...
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Journal Article
Published: 01 April 1995
American Mineralogist (1995) 80 (3-4): 377–386.
... with calcite, bultfonteinite, and chlorite at N’chwaning mine, located in the Kalahari manganese field, northern Cape Province, South Africa. The aggregates consist of light brown, transparent needles, which average 1.0 x 0.1 x 0.05 mm in size. Nchwaningite is named after the mine N’chwaning II, where...
Journal Article
Published: 01 March 2016
European Journal of Mineralogy (2016) 28 (1): 23–32.
...: olivine (Mg, Si), albite (Na, Al, Si), orthoclase (K, Al, Si), and diopside (Ca, Mg, Si). In order to check for the reliability of chemical analyses, a crystal of kenotobermorite from the N’Chwaning II mine, Republic of South Africa, Ca 4 Si 6 O 15 (OH) 2 · 5H 2 O, having a well-defined (Ca:Si) atomic...
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Journal Article
Journal: Economic Geology
Published: 01 November 2002
Economic Geology (2002) 97 (7): 1624–1625.
... at the N’chwaning II mine, turned later into a M.Sc. thesis that was completed under the guidance of Bernd Lehmann in Clausthal. Following my graduation I took up Nic’s offer to return to South Africa to expand on the preliminary results towards a Ph.D. degree in geology. Detailed mineralogical and geochemical...
Journal Article
Published: 01 January 2003
American Mineralogist (2003) 88 (1): 251–255.
... by hydrothermal alteration of primary Mn ores at the Wessels and N’Chwaning II mines in the Kalahari manganese field of South Africa. At the N’Chwaning II mine the mineral is also rock-forming and is associated with grossular, xonotlite, and calcite in calc-silicate lenses. Type material (N’Chwaning II...
Journal Article
Published: 01 February 2002
Mineralogical Magazine (2002) 66 (1): 137–150.
... is manganvesuvianite. Crystal structure analysis of manganvesuvianite indicates that Mn 3+ occupies the five-coordinated square pyramidal Y ′ position leading to Jahn-Teller distortion where the four-fold axis of the square pyramid is elongated. Manganvesuvianite (Wessels mine and N’Chwaning II mine...
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