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![First thumbnail for: Crystal structure of Fe 2 (AsO 4 )(HAsO 4 )(OH)(H ...]()
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![Phase transformation of kaňkite as a function of temperature. Kaňkite dehydrates at temperatures of 55–65 °C.]()
![Top view of the crystal structure of the dehydration product of kaňkite and the hypothetical structure of kaňkite, shown as polyhedral models (left) and topological schemes (right). In the topological schemes, only the cations are shown, Fe3+ as grey circles and As5+ as white circles. Dashed lines in the scheme of the dehydrated kaňkite show the polyhedral linkages that need to be broken in order to allow the transformation from dehydrated kaňkite to the hypothetical structure of kaňkite.]()
![Crystal structures of the lausenite (Majzlan et al., 2005), kornelite (Robinson & Fang, 1973), dehydrated kaňkite (this work), and a hypothetical model of the possible kaňkite structure. The transformation between kornelite and lausenite is reversible (Kong et al., 2011), as shown by the double arrow. The transformation between kaňkite and dehydrated kaňkite cannot be probably reversed, as shown by the single arrow. Small grey arrows indicate the points where the As-O-Fe or S-O-Fe bridges must be broken in the dehydrated forms to obtain the sheet of the hydrated form.]()
![Views of the crystal structure of the dehydration product of kaňkite: a) side view of the corrugated sheets (projection onto 100), b) side view, projection slightly off 100, c) top view of the corrugated sheets (projection onto 010). In c), unit cell is shown by thin black lines; some of the polyhedra are erased in the right-hand part of the figure for a better visualization of the polyhedral linkages. In all figures, Feϕ6 octahedra are grey, Asϕ4 tetrahedra are white and hatched.]()
![Rietveld refinement of a structural model of the dehydration product of kaňkite with the powder XRD data. Grey crosses represent the data, the thick solid line the model. The ticks below the pattern show the expected positions of the peaks; the upper row for the dehydrated kaňkite, the lower row for scorodite (FeAsO4 · 2H2O). The lowermost curve is the difference curve (Imeasured − Icalculated). Parts of the powder profile were excluded due to the presence of peaks arising from the sample holder.]()
![Examples of As-bearing weathering products from the underground mine environment, all sites are located in Czech Republic: (a) stalactites and curtains of amorphous hydrous ferric arsenate (HFA) (approx. 10 cm long; left) and hydrous ferric oxides (HFO) (right) on the timbering in the Giftkies mine, Jáchymov ore district; (b) crusts of kaňkite and scorodite accompanied by white globular aggregates of zýkaite, coatings of HFO and powdery jarosite aggregates. Approximately 1 m wide pile of rock fragments mineralized by weathering arsenopyrite on the floor of an abandoned adit in the Mikulov mine near Teplice; (c) identical secondary mineral association as in (b) (approx. 10 cm long detail of the zýkaite globular aggregates on kaňkite, scorodite, and HFA masses, surrounded by HFO coatings and powdery jarosite aggregates) from the Giftkies mine, Jáchymov ore district; (d) kaňkite crusts (approx. 15 cm in longer dimension) precipitating on the timbering situated beneath the pile of weathered arsenopyrite-rich ore, the Giftkies mine, Jáchymov ore district.]()
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![A comparison of the in-house powder XRD data (upper curve) and synchrotron-source powder XRD data (lower curve) for kaňkite. For the purpose of this comparison, the synchrotron data were recalculated to λ = 1.54056 Å.]()
![Amorphous hydrous ferric arsenate (HFA) fills the intergranular pores and cements the fragments of a historic mining waste dump, Giftkies arsenic mine (Czech Republic). HFA is locally accompanied by scorodite, kaňkite, and hydrous ferric oxide (HFO).]()
![Photomicrographs of arsenopyrite oxidation in natural gossans and weathered zones, Justice mine, Ghana (Bowell 1994b). A. Partial oxidation of arsenopyrite to secondary arsenates and goethite, reflected light, field of view 1 mm; B. Intense alteration of arsenopyrite leading to extensive replacement, reflected light, field of view 1 mm; C. Pseudomorph of arsenopyrite by goethite; D. Gold grains associated with goethite pseudomorph. Bk-bukovskýite ge=goethite; Au=gold; he=hematite; js=jarosite; ka=kaňkite; pt=pitticite; sc=scorodite.]()
![First thumbnail for: The Characterization of Arsenic in Mine Waste]()
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![Geochemical diagrams for Fe-poor orogenic gold mine sites, Waiuta and Bullendale (Fig. 4, Table 7; after Haffert and Craw 2008a,b, 2010; Haffert et al. 2010), showing the environmental stability of As minerals and environmental mobility of dissolved As. Grey ellipses show ranges of water parameters at the mine sites. A. Eh-pH diagram showing dissolved As reactions that cause environmental acidification in mine tailings: oxidation of arsenolite (lower arrow and grey ellipse) and dissolution of scorodite (upper arrow and grey ellipse). B. Waters running off mine tailings with abundant scorodite and/or kaňkite have pH that evolves towards the low dissolved As point of the scorodite dissolution curve of Krause and Ettel (1988). C. Water-saturated arsenolite-rich tailings at Waiuta have extremely high dissolved As(III) at circumneutral pH, but observed dissolved As is still well below saturation with As(III).]()
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![First thumbnail for: Paulišite, Ca 2 Zn(CO 3 ) 3 ·2H 2 O, a new mineral...]()
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1-20 OF 48 RESULTS FOR
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Journal Article
Crystal structure of Fe 2 (AsO 4 )(HAsO 4 )(OH)(H 2 O) 3 , a dehydration product of kaňkite Available to Purchase
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 March 2016
European Journal of Mineralogy (2016) 28 (1): 63–70.
...Juraj Majzlan; Lukáš Palatinus; Jakub Plášil Abstract We report the crystal structure of a dehydration product of the mineral kaňkite (FeAsO 4 · 3.5H 2 O). The structure was solved and refined by precession electron diffraction tomography. Initially, we believed that we solved the structure...
FIGURES
Image
Phase transformation of kaňkite as a function of temperature. Kaňkite dehyd... Available to Purchase
in Crystal structure of Fe 2 (AsO 4 )(HAsO 4 )(OH)(H 2 O) 3 , a dehydration product of kaňkite
> European Journal of Mineralogy
Published: 01 March 2016
Fig. 1 Phase transformation of kaňkite as a function of temperature. Kaňkite dehydrates at temperatures of 55–65 °C.
Image
Top view of the crystal structure of the dehydration product of kaňkite and... Available to Purchase
in Crystal structure of Fe 2 (AsO 4 )(HAsO 4 )(OH)(H 2 O) 3 , a dehydration product of kaňkite
> European Journal of Mineralogy
Published: 01 March 2016
Fig. 6 Top view of the crystal structure of the dehydration product of kaňkite and the hypothetical structure of kaňkite, shown as polyhedral models (left) and topological schemes (right). In the topological schemes, only the cations are shown, Fe 3+ as grey circles and As 5+ as white circles
Image
Crystal structures of the lausenite ( Majzlan et al. , 2005 ), kornelite (... Available to Purchase
in Crystal structure of Fe 2 (AsO 4 )(HAsO 4 )(OH)(H 2 O) 3 , a dehydration product of kaňkite
> European Journal of Mineralogy
Published: 01 March 2016
Fig. 3 Crystal structures of the lausenite ( Majzlan et al. , 2005 ), kornelite ( Robinson & Fang, 1973 ), dehydrated kaňkite (this work), and a hypothetical model of the possible kaňkite structure. The transformation between kornelite and lausenite is reversible ( Kong et al. , 2011
Image
Views of the crystal structure of the dehydration product of kaňkite: a) si... Available to Purchase
in Crystal structure of Fe 2 (AsO 4 )(HAsO 4 )(OH)(H 2 O) 3 , a dehydration product of kaňkite
> European Journal of Mineralogy
Published: 01 March 2016
Fig. 4 Views of the crystal structure of the dehydration product of kaňkite: a) side view of the corrugated sheets (projection onto 100), b) side view, projection slightly off 100, c) top view of the corrugated sheets (projection onto 010). In c), unit cell is shown by thin black lines; some
Image
Rietveld refinement of a structural model of the dehydration product of kaň... Available to Purchase
in Crystal structure of Fe 2 (AsO 4 )(HAsO 4 )(OH)(H 2 O) 3 , a dehydration product of kaňkite
> European Journal of Mineralogy
Published: 01 March 2016
Fig. 2 Rietveld refinement of a structural model of the dehydration product of kaňkite with the powder XRD data. Grey crosses represent the data, the thick solid line the model. The ticks below the pattern show the expected positions of the peaks; the upper row for the dehydrated kaňkite
Image
Examples of As-bearing weathering products from the underground mine enviro... Available to Purchase
Published: 01 January 2014
in the Giftkies mine, Jáchymov ore district; (b) crusts of kaňkite and scorodite accompanied by white globular aggregates of zýkaite, coatings of HFO and powdery jarosite aggregates. Approximately 1 m wide pile of rock fragments mineralized by weathering arsenopyrite on the floor of an abandoned adit
Journal Article
Ferric vs. ferrous arsenate amorphous precursors: Properties and controls on scorodite mineralization Available to Purchase
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 April 2025
American Mineralogist (2025) 110 (4): 537–546.
... such as scorodite (FeAsO 4 ·2H 2 O) and kankite (FeAsO 4 ·3.5H 2 O). These amorphous phases have varied structures and compositions depending on the geochemical conditions under which they form but have not been well characterized except for the frequently encountered amorphous ferric arsenate (represented as AFe...
FIGURES
Includes: Supplemental Content
Image
A comparison of the in-house powder XRD data (upper curve) and synchrotron-... Available to Purchase
in Crystal structure of Fe 2 (AsO 4 )(HAsO 4 )(OH)(H 2 O) 3 , a dehydration product of kaňkite
> European Journal of Mineralogy
Published: 01 March 2016
Fig. 7 A comparison of the in-house powder XRD data (upper curve) and synchrotron-source powder XRD data (lower curve) for kaňkite. For the purpose of this comparison, the synchrotron data were recalculated to λ = 1.54056 Å.
Image
Amorphous hydrous ferric arsenate (HFA) fills the intergranular pores and c... Available to Purchase
Published: 01 January 2014
Figure 14 Amorphous hydrous ferric arsenate (HFA) fills the intergranular pores and cements the fragments of a historic mining waste dump, Giftkies arsenic mine (Czech Republic). HFA is locally accompanied by scorodite, kaňkite, and hydrous ferric oxide (HFO).
Journal Article
Parascorodite, FeAsO 4 .2H 2 O; a new mineral from Kank near Kutna Hora, Czech Republic Available to Purchase
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 September 1999
American Mineralogist (1999) 84 (9): 1439–1444.
...Petr Ondrus; Roman Skala; Cecilia Viti; Frantisek Veselovsky; Frantisek Novak; Jiri Jansa Abstract Parascorodite, a new mineral from Kank near Kutna Hora, Central Bohemia, Czech Republic, forms earthy white to white-yellow aggregates associated with scorodite, pitticite, bukovskyite, kankite...
Image
Photomicrographs of arsenopyrite oxidation in natural gossans and weathered... Available to Purchase
Published: 01 January 2014
to extensive replacement, reflected light, field of view 1 mm; C. Pseudomorph of arsenopyrite by goethite; D. Gold grains associated with goethite pseudomorph. Bk-bukovskýite ge=goethite; Au=gold; he=hematite; js=jarosite; ka=kaňkite; pt=pitticite; sc=scorodite.
Journal Article
The Characterization of Arsenic in Mine Waste Available to Purchase
Publisher: Mineralogical Society of America
Published: 01 January 2014
Reviews in Mineralogy and Geochemistry (2014) 79 (1): 473–505.
... to extensive replacement, reflected light, field of view 1 mm; C. Pseudomorph of arsenopyrite by goethite; D. Gold grains associated with goethite pseudomorph. Bk-bukovskýite ge=goethite; Au=gold; he=hematite; js=jarosite; ka=kaňkite; pt=pitticite; sc=scorodite. ...
FIGURES
Image
Geochemical diagrams for Fe-poor orogenic gold mine sites, Waiuta and Bulle... Available to Purchase
Published: 01 January 2014
with abundant scorodite and/or kaňkite have pH that evolves towards the low dissolved As point of the scorodite dissolution curve of Krause and Ettel (1988) . C. Water-saturated arsenolite-rich tailings at Waiuta have extremely high dissolved As(III) at circumneutral pH, but observed dissolved As is still well
Journal Article
Parageneses and Crystal Chemistry of Arsenic Minerals Available to Purchase
Publisher: Mineralogical Society of America
Published: 01 January 2014
Reviews in Mineralogy and Geochemistry (2014) 79 (1): 17–184.
... in the Giftkies mine, Jáchymov ore district; (b) crusts of kaňkite and scorodite accompanied by white globular aggregates of zýkaite, coatings of HFO and powdery jarosite aggregates. Approximately 1 m wide pile of rock fragments mineralized by weathering arsenopyrite on the floor of an abandoned adit...
FIGURES
Journal Article
MINERALS IN CONTAMINATED ENVIRONMENTS: CHARACTERIZATION, STABILITY, IMPACT Available to Purchase
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 June 2009
The Canadian Mineralogist (2009) 47 (3): 489–492.
... combined conventional petrographic and mineral-analysis techniques with synchrotron micro-analytical techniques (μSXRF, μXAS and μXRD) and identified numerous As-hosting phases, commonly intergrown, including secondary arsenates (pharmacosiderite, scorodite, yukonite, kankite, amorphous ferric arsenate...
Journal Article
Secondary uranyl arsenates–phosphates and Sb–Bi-rich minerals of the segnitite–philipsbornite series in the oxidation zone at the Prakovce-Zimná Voda REE–U–Au quartz-vein mineralisation, Western Carpathians, Slovakia Available to Purchase
Journal: Mineralogical Magazine
Published: 04 October 2023
Mineralogical Magazine (2023) 87 (6): 849–865.
... oxidation zones of uranium and base-metal sulfide deposits, uranium mine tailings, and drainage systems also contain abundant Fe oxides and arsenates. The Fe oxides are typically represented by goethite and ferrihydrite, whereas common crystalline Fe arsenates include scorodite, kaňkite, symplesite...
FIGURES
Journal Article
Paulišite, Ca 2 Zn(CO 3 ) 3 ·2H 2 O, a new mineral with a novel crystal structure Available to Purchase
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 March 2025
American Mineralogist (2025) 110 (3): 480–488.
... but is also known for supergene minerals sub-recently formed over hundreds of years, especially in strongly weathered medieval mine dumps. The long-known bukovskýite, Fe 3+ (AsO 4 )(SO 4 )(OH)·9H 2 O ( Bukovský 1915 ; Novák et al. 1967 ), was followed by the more recent descriptions of kaňkite, Fe 3+ (AsO 4...
FIGURES
Includes: Supplemental Content
Journal Article
New minerals and nomenclature modifications approved in 2012 Available to Purchase
Journal: Mineralogical Magazine
Published: 01 February 2012
Mineralogical Magazine (2012) 76 (1): 151–155.
.... Belakovskiy, Anna G. Turchkova, Panagiotis Voudouris, Athanassios Katerinopoulos and Andreas Magganas *E-mail: [email protected] Related to kaňkite Monoclinic: C 2, Cm or C 2/ m Tanco mine, Bernic Lake, Manitoba, Canada Mark A. Cooper, Robert Ramik, Frank C. Hawthorne*, Neil A. Ball...
Journal Article
Thermodynamic Properties for Arsenic Minerals and Aqueous Species Available to Purchase
Publisher: Mineralogical Society of America
Published: 01 January 2014
Reviews in Mineralogy and Geochemistry (2014) 79 (1): 217–255.
... stable solid phase in this system, whereas fine-grained scorodite specimens, amorphous ferric arsenates, or metastable phases such as kaňkite, FeAsO 4 ·3.5H 2 O ( cr ) , have higher solubility. In strongly acidic solutions, scorodite dissolves congruently (with respect to the original Fe/As ratio...
FIGURES
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