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Journal Article

Crystal structure of glaucodot, (Co,Fe)AsS, and its relationships to marcasite and arsenopyrite Available to Purchase

Hexiong Yang, Robert T. Downs
Published: 01 July 2008
American Mineralogist (2008) 93 (7): 1183–1186.
DOI: https://doi.org/10.2138/am.2008.2966
...Hexiong Yang; Robert T. Downs Abstract The crystal structure of glaucodot, (Co,Fe)AsS, an important member of the FeAsS-CoAsS-NiAsS system, was determined with single-crystal X-ray diffraction. It is orthorhombic with space group Pn 2 1 m and unit-cell parameters a = 14.158(1), b = 5.6462(4), c...
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View PDF for article title, Crystal structure of <span class="search-highlight">glaucodot</span>, (Co,Fe)AsS, and its relationships to marcasite and arsenopyrite
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Cobalt zone textures at the McAra deposit. (A) Quartz–glaucodot–cobaltite vein from the largest cobalt zone that transects the copper-rich part of the volcanogenic massive sulfide (VMS) deposit in sedimentary rocks. (B) Cobalt-rich breccia, with glaucodot–cobaltite as both clast and matrix material. (C) Glaucodot–cobaltite veins in a mafic volcanic rock near the contact with the copper-rich part of the VMS deposit. Photos are of NQ-size core that is ∼5 cm in diameter. Sample locations are denoted on Figs. 7 and 9. Co, glaucodot–cobaltite; Cpy, chalcopyrite; Py, pyrite; Qtz, quartz. [Colour online.]

Cobalt zone textures at the McAra deposit. (A) Quartz–glaucodot–cobaltite v... Available to Purchase

Published: 10 July 2020
Fig. 12. Cobalt zone textures at the McAra deposit. (A) Quartz–glaucodot–cobaltite vein from the largest cobalt zone that transects the copper-rich part of the volcanogenic massive sulfide (VMS) deposit in sedimentary rocks. (B) Cobalt-rich breccia, with glaucodot–cobaltite as both clast
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(a) Back-scattered electron image of zoned glaucodot (SA-2) and cobaltite (SA-1) crystals from Scar Crags. (b–c) X-ray cobalt, nickel and iron element-distribution maps of the same crystals as in (a). (e) Back-scattered electron image of zoned cobaltite (SA-1) crystal from Scar Crags. (f–h) X-ray cobalt, iron, and nickel element-distribution maps of the same crystal as in (e). 1, 2 in panels (b–d) indicate spot EMPA, reported in Table 2 as “1”, “2” (for grain SA-2). 1, 2, 3 and 4 in panels (f–h) indicate spot EMPA, reported in Table 2 as “1”, “2”, “3” and “4” (for grain SA-1).

(a) Back-scattered electron image of zoned glaucodot (SA-2) and cobaltite (... Open Access

Published: 10 March 2021
Fig. 10. (a) Back-scattered electron image of zoned glaucodot (SA-2) and cobaltite (SA-1) crystals from Scar Crags. (b–c) X-ray cobalt, nickel and iron element-distribution maps of the same crystals as in (a). (e) Back-scattered electron image of zoned cobaltite (SA-1) crystal from Scar Crags. (f
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Polyhedral view of the glaucodot structure. Large and small spheres represent As and S atoms, respectively. The A, B, and C chains, made of the edge-shared M1, M2, and M3 octahedra, respectively, are arranged along a in the sequence of A-A-B-C-C-B-A-A...

Polyhedral view of the glaucodot structure. Large and small spheres represe... Available to Purchase

Published: 01 July 2008
F igure 3. Polyhedral view of the glaucodot structure. Large and small spheres represent As and S atoms, respectively. The A, B, and C chains, made of the edge-shared M1, M2, and M3 octahedra, respectively, are arranged along a in the sequence of A-A-B-C-C-B-A-A...
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Scanned PIXE maps of a composite cobaltite (Cob)-glaucodot/alloclasite (Gdt)-arsenical pyrite grain (cf. Fig. 9). The cobaltite nucleus is auriferous (ca. 400 ppm) whereas the apparent gold response in the glaucodot is a noise artefact related to the high As-content. The faintest As signals near the rim of this composite grain reflect concentrations close to the detection limit which is lower than 10 ppm. This implies that the As abundance in the composite grain varies by four orders of magnitude. FTCD028, 187.5 m.

Scanned PIXE maps of a composite cobaltite (Cob)-glaucodot/alloclasite (Gdt... Available to Purchase

Published: 01 July 2007
Fig. 10. Scanned PIXE maps of a composite cobaltite (Cob)-glaucodot/alloclasite (Gdt)-arsenical pyrite grain (cf. Fig. 9 ). The cobaltite nucleus is auriferous (ca. 400 ppm) whereas the apparent gold response in the glaucodot is a noise artefact related to the high As-content. The faintest
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(a–l) Photomicrographs of mineralisation from Scar Crags. All: Alloclasite, Bi: Native bismuth, Bis: Bismuthinite, Apy: Arsenopyrite, Chl: Chlorite, Cob: Cobaltite, Ccp: Chalcopyrite, Gla: Glaucodot, Ni-Gla: Ni-bearing glaucodot, Qz: Quartz. (a, b, j, k, l) parallel polars observation. (c–i) crossed polars observation.

(a–l) Photomicrographs of mineralisation from Scar Crags. All: Alloclasite,... Open Access

Published: 10 March 2021
Fig. 6. (a–l) Photomicrographs of mineralisation from Scar Crags. All: Alloclasite, Bi: Native bismuth, Bis: Bismuthinite, Apy: Arsenopyrite, Chl: Chlorite, Cob: Cobaltite, Ccp: Chalcopyrite, Gla: Glaucodot, Ni-Gla: Ni-bearing glaucodot, Qz: Quartz. (a, b, j, k, l) parallel polars observation. (c
Journal Article

Mineral sources and transport pathways for arsenic release in a coastal watershed, USA Available to Purchase

N.K. Foley, R.A. Ayuso
Published: 01 February 2008
Geochemistry: Exploration, Environment, Analysis (2008) 8 (1): 59–75.
DOI: https://doi.org/10.1144/1467-7873/07-152
... As content by weight: löllingite and realgar ( c. 70%), arsenopyrite, cobaltite, glaucodot, and gersdorffite (in the range of 34–45%), arsenian pyrite (<4%), and pyrrhotite (<0.15%). In the Penobscot Formation, the relative stability of primary As-bearing minerals follows a pattern where the most...
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a. Photograph of massive albitite from the Contact Lake southeast area. b. Photographic view of the K2 Cu-Au-Co-Ag-enriched sulfarsenide gossan. c. Reflected light photomicrograph showing cobaltian arsenopyrite, glaucodot, and chalcopyrite from K2. d. Reflected light photomicrograph of chalcopyrite, bornite, and covellite mineralization from the Thompson showing. e . Photographic view looking southeast across Gossan Island toward K2 and the Contact Lake Belt. f. Magnetite-altered andesite. Abbreviations: Bn = bornite, Co-Asp = cobaltian arsenopyrite, Cpy = chalcopyrite, Cv = covellite, Gld = glaucodot, Mt = magnetite, Plag = plagioclase.

a . Photograph of massive albitite from the Contact Lake southeast area. ... Available to Purchase

Published: 01 July 2007
Fig. 7. a . Photograph of massive albitite from the Contact Lake southeast area. b . Photographic view of the K2 Cu-Au-Co-Ag-enriched sulfarsenide gossan. c . Reflected light photomicrograph showing cobaltian arsenopyrite, glaucodot, and chalcopyrite from K2. d . Reflected light
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Backscattered electron images illustrating textural relationships between sulfarsenides, arsenides, galena, bismuth, and gold minerals in pyrrhotite-rich massive sulfide samples. A. Fine-grained mixture of sulfarsenides and arsenides superimposed on coarser grained isocubanite (iso) and altered pyrrhotite (po). Interstices between pyrrhotite crystals are partly filled with Fe oxyhydroxides. B. Composite grain of arsenopyrite (asp) and native bismuth (Bi) in core of pyrrhotite tablet. C. Glaucodot (glau) hosting elongate inclusion as well as overgrowth composed of native bismuth (Bi) and gold (Au). Glaucodot is in contact with pyrrhotite (po) and isocubanite (iso). D. Angular composite grain of native bismuth (Bi), BiTe sulfide (BiTeS), and maldonite (mal) along the contact between isocubanite (iso) and glaucodot (glau). E. Spheroidal native bismuth grain containing gold blebs (Bi + Au) protruding into open space from the surface of isocubanite (iso). F. Same as (E) at higher magnification. In this intergrowth, native bismuth is the dominant phase by volume. G. Native bismuth (Bi) with oxidized rim (alt) and gold blebs (Au) in unaltered core. H. Native bismuth (Bi) with gold blebs (Au) intergrown with electrum (Au-Ag). The native bismuth and electrum are both partly enclosed by galena (gl).

Backscattered electron images illustrating textural relationships between s... Available to Purchase

Published: 01 September 2005
) and altered pyrrhotite (po). Interstices between pyrrhotite crystals are partly filled with Fe oxyhydroxides. B. Composite grain of arsenopyrite (asp) and native bismuth (Bi) in core of pyrrhotite tablet. C. Glaucodot (glau) hosting elongate inclusion as well as overgrowth composed of native bismuth (Bi
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Comparison of the mixed (As + S) anionic layers in (a) arsenopyrite and (b) glaucodot.

Comparison of the mixed (As + S) anionic layers in ( a ) arsenopyrite and (... Available to Purchase

Published: 01 July 2008
F igure 2. Comparison of the mixed (As + S) anionic layers in ( a ) arsenopyrite and ( b ) glaucodot.
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Electron microprobe data (in mol %) for sulfarsenide (A) and arsenide minerals (B) from pyrrhotite-rich samples. The compositional boundaries (dashed lines) between sulfarsenide minerals are from Petruk et al. (1971) and Gammon (1966). Gammon (1966) proposed that approximately 9 wt percent or more Co in arsenopyrite results in destabilization of the arsenopyrite lattice and crystallization of glaucodot. Accordingly, the compositional boundary between arsenopyrite and glaucodot is placed at 25 mol percent CoAsS. According to Roseboom (1963) and Radcliffe and Berry (1968 and Radcliffe and Berry (1971), there is complete solid solution between FeAs2 and CoAs2. The term löllingite is generally restricted to (Fe,Co)As2 with ≤3 mol percent CoAs2 (Radcliffe and Berry, 1968).

Electron microprobe data (in mol %) for sulfarsenide (A) and arsenide miner... Available to Purchase

Published: 01 September 2005
wt percent or more Co in arsenopyrite results in destabilization of the arsenopyrite lattice and crystallization of glaucodot. Accordingly, the compositional boundary between arsenopyrite and glaucodot is placed at 25 mol percent CoAsS. According to Roseboom (1963) and Radcliffe and Berry (1968
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Comparison of crystal structures of (a) marcasite, (b) alloclasite, (c) arsenopyrite, and (d) glaucodot. Large, medium, and small spheres represent As, S, and M (=Fe + Co + Ni) atoms, respectively.

Comparison of crystal structures of ( a ) marcasite, ( b ) alloclasite, ( c... Available to Purchase

Published: 01 July 2008
F igure 1. Comparison of crystal structures of ( a ) marcasite, ( b ) alloclasite, ( c ) arsenopyrite, and ( d ) glaucodot. Large, medium, and small spheres represent As, S, and M (=Fe + Co + Ni) atoms, respectively.
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Paragenetic sequence of mineralization and alteration in the Yinachang deposit. The width of the solid lines denotes relative abundances of minerals. Rare metal sulfides include glaucodot, bismuthinite, and sphalerite. REE minerals include allanite, synchysite, bastnäsite, monazite, and xenotime.

Paragenetic sequence of mineralization and alteration in the Yinachang depo... Available to Purchase

Published: 01 August 2015
Fig. 6 Paragenetic sequence of mineralization and alteration in the Yinachang deposit. The width of the solid lines denotes relative abundances of minerals. Rare metal sulfides include glaucodot, bismuthinite, and sphalerite. REE minerals include allanite, synchysite, bastnäsite, monazite
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a. SEM-backscattered electron image showing a veinlet association of gold (Au), chalcopyrite (Ccp), glaucodot (Gdt), and barite (Brt) in pyrite (Py). FTCD075, 117.1 m. b. SEM-backscattered electron image of a sylvanite grain.

a . SEM-backscattered electron image showing a veinlet association of gold... Available to Purchase

Published: 01 July 2007
Fig. 14. a . SEM-backscattered electron image showing a veinlet association of gold (Au), chalcopyrite (Ccp), glaucodot (Gdt), and barite (Brt) in pyrite (Py). FTCD075, 117.1 m. b . SEM-backscattered electron image of a sylvanite grain.
Journal Article

Characterising As–Bi–Co–Cu-bearing minerals at Scar Crags and Dale Head North, Lake District, UK Open Access

Giulio F.D. Solferino, Nathan T. Westwood, Adam Eskdale, Sean C. Johnson
Published: 10 March 2021
Mineralogical Magazine (2021) 85 (2): 197–214.
DOI: https://doi.org/10.1180/mgm.2021.22
...Fig. 10. (a) Back-scattered electron image of zoned glaucodot (SA-2) and cobaltite (SA-1) crystals from Scar Crags. (b–c) X-ray cobalt, nickel and iron element-distribution maps of the same crystals as in (a). (e) Back-scattered electron image of zoned cobaltite (SA-1) crystal from Scar Crags. (f...
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Regional and local controls on Archean rock-hosted cobalt mineralization at the McAra deposit, southern Superior Province, Ontario, Canada Available to Purchase

Michael D. Hendrickson
Published: 10 July 2020
Canadian Journal of Earth Sciences (2020) 57 (12): 1447–1462.
DOI: https://doi.org/10.1139/cjes-2020-0059
...Fig. 12. Cobalt zone textures at the McAra deposit. (A) Quartz–glaucodot–cobaltite vein from the largest cobalt zone that transects the copper-rich part of the volcanogenic massive sulfide (VMS) deposit in sedimentary rocks. (B) Cobalt-rich breccia, with glaucodot–cobaltite as both clast...
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View PDF for article title, Regional and local controls on Archean rock-hosted cobalt mineralization at the McAra deposit, southern Superior Province, Ontario, Canada
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Journal Article

A survey of hybrid twins in non-silicate minerals Available to Purchase

Massimo Nespolo, Giovanni Ferraris
Published: 01 August 2009
European Journal of Mineralogy (2009) 21 (4): 673–690.
DOI: https://doi.org/10.1127/0935-1221/2009/0021-1937
..., brookite, butlerite, calcite, cassiterite, celestine, chalcostibite, corundum, cryolite, derbylite, diaphorite, dolomite, euxenite-(Y), columbite-(Fe) (also known as ferrocolumbite), glaucodot, gudmundite, gypsum, haindingerite, hausmannite, hematite, ilmenite, iodargyrite, linarite, kotoite, marcasite...
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Journal Article

Gold Enrichment and the Bi-Au Association in Pyrrhotite-Rich Massive Sulfide Deposits, Escanaba Trough, Southern Gorda Ridge Available to Purchase

Tuomo O. Törmänen, Randolph A. Koski
Journal: Economic Geology
Published: 01 September 2005
Economic Geology (2005) 100 (6): 1135–1150.
DOI: https://doi.org/10.2113/gsecongeo.100.6.1135
...) and altered pyrrhotite (po). Interstices between pyrrhotite crystals are partly filled with Fe oxyhydroxides. B. Composite grain of arsenopyrite (asp) and native bismuth (Bi) in core of pyrrhotite tablet. C. Glaucodot (glau) hosting elongate inclusion as well as overgrowth composed of native bismuth (Bi...
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Cobalt-arsenic minerals associated with aplites, at Cobalt, Ontario Available to Purchase

Edward Sampson, Michael Edward Hriskevich
Journal: Economic Geology
Published: 01 January 1957
Economic Geology (1957) 52 (1): 60–75.
DOI: https://doi.org/10.2113/gsecongeo.52.1.60
...Edward Sampson; Michael Edward Hriskevich Abstract In the Bass Lake area, about 3 miles from the town of Cobalt, soda-rich aplites are developed in the upper part of the Nipissing diabase sheet. Associated with these aplites are the following metallic minerals: pyrite, skutterudite, glaucodot...
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Photographs (a), photomicrographs (b to i) and BSE images (j to l) associated with Cu-(REE) mineralization stage (stage III). (a) Molybdenite veinlet in Cu-rich ore. (b) Fe-Cu ore with magnetite overprinted by chalcopyrite. (c) and (f) The same region under reflected light and cross polarized light, respectively, showing groups of apatite grains enclosed by chalcopyrite. Note that in (c) a few pyrite grains are also enclosed by chalcopyrite. (d) and (e) The same region under transparent light and cross polarized light, respectively, showing elongated fluorite, ankerite, chalcopyrite and minor apatite in deformed Cu-rich ore. (g) Biotite, ankerite, and minor apatite in association with chalcopyrite in Cu-rich ore. (h) Large, euhedral allanite grains associated with chalcopyrite. (i) Synchysite aggregates in Cu-rich ore. (j) Euhedral glaucodot grains enclosed by or intergrown with chalcopyrite. (k) Anhedral Nb- and Y-bearing phase in Cu-rich ore. (l) Irregular U-rich phase (most probably uraninite) enclosed by chalcopyrite. Abbreviations: Alla = allanite, Anker = ankerite, Ap = apatite, Bt = biotite, Ccp = chalcopyrite, Flu = fluorite, Glau = glaucodot, Mo = molybdenite, Mt = magnetite, Py = pyrite, Syn = synchysite.

Photographs (a), photomicrographs (b to i) and BSE images (j to l) associat... Available to Purchase

Published: 01 August 2015
and minor apatite in deformed Cu-rich ore. (g) Biotite, ankerite, and minor apatite in association with chalcopyrite in Cu-rich ore. (h) Large, euhedral allanite grains associated with chalcopyrite. (i) Synchysite aggregates in Cu-rich ore. (j) Euhedral glaucodot grains enclosed by or intergrown