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germanium

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Journal Article
Published: 08 April 2020
The Canadian Mineralogist (2020) 58 (2): 191–201.
... and pearceite were differentiated by their chemistry. Although the presence of argyrodite in epithermal deposits with silver sulfosalts is relatively common, this first mention in Cerro Moro is highly encouraging for exploration for germanium, a critical element, which is also considered strategic by countries...
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Journal Article
Journal: Geology
Published: 17 December 2019
Geology (2020) 48 (3): 236–241.
..., this study shows that plastic deformation and subsequent syntectonic recrystallization of sphalerite (zinc sulfide, ZnS) led to the spatial redistribution of germanium (Ge): from a background level of a few hundreds of parts per million in undeformed primary sphalerite to tens of weight-percent...
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Journal Article
Published: 01 September 2019
European Journal of Mineralogy (2019) 31 (5-6): 983–997.
... Verlagsbuchhandlung, 70176 Stuttgart, Germany 2019 willemite germanium non-sulphide zinc deposits critical elements supergene The supergene zone of sulphide-rich ore deposits has long been a focus for the mining industry, as fractionation processes due to weathering can lead to significant metal...
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Journal Article
Published: 01 March 2019
European Journal of Mineralogy (2019) 31 (2): 325–333.
...-rich sphalerite from the Tres Marias Zn–Pb–Ge deposit in Mexico and auriferous arsenopyrite from the Ashanti Au mine in Ghana are investigated. Sphalerite from Tres Marias contains Ge concentrations of up to 1430 μg/g and is characterised by elevated Fe contents. Germanium is homogeneously distributed...
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Journal Article
Published: 01 May 2018
Mineralogical Magazine (2018) 82 (S1): S61–S87.
... of the fluids fluctuated during ore deposition suggesting different fluid pulses (system rejuvenation and/or boiling). The enrichment in Te, Se and Bi enrichment is supportive of a magmatic contribution to the ore fluid, while graphite in the metamorphic basement could be the source of germanium, although...
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Journal Article
Published: 01 May 2018
Mineralogical Magazine (2018) 82 (S1): S89–S114.
..., goethite and hematite. Germanium occurs at ppm levels in W1 and W2, and in scarcely detectable amounts in hemimorphite, goethite and hematite. Indium has low concentrations in goethite and hematite. These different deportments among the various phases are probably due to the different initial Ga, In and Ge...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP435.2
EISBN: 9781786202901
... in a combined [AlO 4 |Li] centre. Since Li only accounts for 10–30% of the Al concentration, the remaining Al needs to be balanced by H. The ratio of Li/H-compensated Al centres seems to depend on the Li activity and the pH in the aqueous solution. Germanium concentrations in quartz cements are slightly higher...
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Journal Article
Published: 01 October 2017
Mineralogical Magazine (2017) 81 (5): 1151–1159.
...: luca.bindi@unifi.it 26 9 2016 26 10 2016 © 2017 The Mineralogical Society 2017 omariniite new mineral species copper-iron-zinc-germanium-sulfide electron-microprobe analyses reflectance data crystal structure La Rosario vein Capillitas district Catamarca Province Argentina...
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Journal Article
Published: 01 July 2017
The Canadian Mineralogist (2017) 55 (4): 799–820.
... trace-elements REE germanium geological formation Euclase obtained from Ouro Preto in Brazil was studied and named by the French mineralogist René Just Haüy in 1792. Its name is derived from the Greek words “eu” and “klasis” which mean “well breaking”, referring to its perfect cleavage along...
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Journal Article
Journal: Geology
Published: 01 February 2017
Geology (2017) 45 (2): e408.
Journal Article
Journal: Geology
Published: 01 February 2017
Geology (2017) 45 (2): e407.
Journal Article
Published: 01 January 2017
Reviews in Mineralogy and Geochemistry (2017) 82 (1): 601–656.
...Olivier J. Rouxel; Béatrice Luais © 2017 Mineralogical Society of America 2017 Germanium (Ge) is a trace element in the Earth’s crust and natural waters, averaging about 1.6 ppm in rocks and minerals ( El Wardani 1957 ; Bernstein 1985 ) and 75 picomol/L in seawater ( Froelich...
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Journal Article
Published: 01 September 2016
The Canadian Mineralogist (2016) 54 (5): 1261–1284.
... deposition. Electron microprobe and LA-ICP-MS analyses reveal complex chemical zoning in the sphalerites together with coupling of two main groups of trace elements: copper, germanium, and gallium; and iron and cadmium. The zoning is interpreted in terms of substitution mechanisms using different equations...
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Series: Reviews in Economic Geology, Reviews in Economic Geology
Published: 01 January 2016
DOI: 10.5382/Rev.18.11
EISBN: 9781629490922
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Journal Article
Published: 01 November 2015
American Mineralogist (2015) 100 (11-12): 2533–2544.
.... Chadwick O.A. ( 2002 ) Germanium-silicon fractionation in the weathering environment . Geochimica et Cosmochimica Acta , 66 , 1525 – 1537 . Kushiro I. ( 2001 ) Partial melting experiments on peridotite and origin of mid-ocean ridge basalt . Annual Review of Earth and Planetary Sciences...
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Journal Article
Published: 01 November 2014
American Mineralogist (2014) 99 (11-12): 2337–2343.
... germanium increases this distance, d , to the upper limit observed in both methods and decreases the stability in terms of enthalpy. This order of stability also corresponds to reactivity of hydroxo bridges to isotope exchange, as noted before ( Rustad et al. 2004 ). While all of the B3LYP results...
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Journal Article
Published: 01 January 2014
American Mineralogist (2014) 99 (1): 57–64.
...-bearing canfieldite from Panasqueira, Portugal, with the following average composition (wt%): Ag 57.39, Sn 9.8, Te 19.095, S 9.86, Cu 2.44, Fe 1.95, Zn 0.08, total 100.62. A Te-bearing silver-germanium sulfosalt found in association with hessite, Ag-Au tellurides, altaite, and base metal sulfides...
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Journal Article
Published: 01 July 2013
Journal of Micropalaeontology (2013) 32 (2): 207–217.
... of continuous deep-sea biogenic sedimentation in Early Palaeozoic oceans . Geology , 29 : 755 – 758 . Tribovillard N. Bout-Roumazeilles V. Riboulleau A. Baudin F. Danelian T. Riquier L. 2011 . Transfer of germanium to marine sediments: insights from its accumulation...
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Journal Article
Published: 01 June 2013
Mineralogical Magazine (2013) 77 (4): 403–417.
... exhibited interferences. For quantification 71 Ga and 74 Ge were employed due to their lower limits of detection (LOD). Calibration with normalization to the ideal formula of topaz with silicon content of 15.41 wt.% was performed using certified reference material NIST612. topaz germanium gallium...
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Journal Article
Published: 01 May 2013
American Mineralogist (2013) 98 (5-6): 848–858.
... exist to date: the “f-phase” in which Fe is fully octahedral and the “akdalaite-model” possessing 20% of the Fe atoms in tetrahedral coordination. In this study, germanium was used as a structural probe to re-examine the validity of the latter model. Germanium-bearing ferrihydrites containing 0.2, 0.6...
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