Kaňkite
A valid IMA mineral species
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About Kaňkite
Formula:
FeAsO4 · 3.5H2O
Colour:
Yellowish green, paler greenish yellow on exposure to air; very pale grayish yellow to pale yellow in transmitted light
Lustre:
Vitreous, Dull
Hardness:
2 - 3
Specific Gravity:
2.60 - 2.70
Crystal System:
Monoclinic
Name:
Named for the type locality.
Related to and easily confused with hilarionite, but also with fine-grained scorodite. Compare 'UM1979-03-AsO:Fe' and 'UM1979-04-AsO:Fe'.
Often associated with bukovskýite.
Crystal structure not yet solved, as the mineral decomposes in vacuum to Fe2(AsO4)(HAsO4)(OH)(H2O), that equals FeAsO4.2H2O. The crystal structure of this phase (space group Cc) has corrugated sheets of heteropolyhedra. The building unit comprises a pair of Fe-bearing octahedra decorated by 5 arsenate tetrahedra. Kaňkite dehydrates to FeAsO4.2H2O at 55–56°C. Its structure is supposed to be similar to the above described, in terms of the presence of corrugated sheets (Majzlan et al., 2016).
Often associated with bukovskýite.
Crystal structure not yet solved, as the mineral decomposes in vacuum to Fe2(AsO4)(HAsO4)(OH)(H2O), that equals FeAsO4.2H2O. The crystal structure of this phase (space group Cc) has corrugated sheets of heteropolyhedra. The building unit comprises a pair of Fe-bearing octahedra decorated by 5 arsenate tetrahedra. Kaňkite dehydrates to FeAsO4.2H2O at 55–56°C. Its structure is supposed to be similar to the above described, in terms of the presence of corrugated sheets (Majzlan et al., 2016).
Name Encoding
CP1252:
Kankite
Latin-1:
Kankite
ASCII-7:
Kankite
Unique Identifiers
Mindat ID:
2153
Long-form identifier:
mindat:1:1:2153:7
Similar Names
| Kandite | D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn | |
| Kaneite | MnAs | |
| Kangite | A valid IMA mineral species | (Sc,Ti,Al,Zr,Mg,Ca,◻)2O3 |
| Kanoite | A valid IMA mineral species | Mn2+MgSi2O6 |
| Kansite (of Meyer et al.) | A synonym of Mackinawite | |
| Konukita | A synonym of Native Chromium | |
| Tankite (of Haidinger) | A synonym of Xenotime-(Y) |
IMA Classification of Kaňkite
Classification of Kaňkite
8.CE.60
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
40.5.4.
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
20.9.3
20 : Arsenates (also arsenates with phosphate, but without other anions)
9 : Arsenates of Fe
20 : Arsenates (also arsenates with phosphate, but without other anions)
9 : Arsenates of Fe
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Kňk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Knk | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Kaňkite
Vitreous, Dull
Transparency:
Translucent
Colour:
Yellowish green, paler greenish yellow on exposure to air; very pale grayish yellow to pale yellow in transmitted light
Streak:
Grayish yellow
Hardness:
2 - 3 on Mohs scale
Fracture:
Irregular/Uneven
Density:
2.60 - 2.70 g/cm3 (Measured) 2.732 g/cm3 (Calculated)
Optical Data of Kaňkite
Type:
Biaxial
RI values:
nα = 1.664(2) nγ = 1.680(2)
Max. Birefringence:
δ = 0.016
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Dispersion:
strong
Chemistry of Kaňkite
Mindat Formula:
FeAsO4 · 3.5H2O
Element Weights:
Elements listed:
Crystallography of Kaňkite
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P2
Setting:
P2
Cell Parameters:
a = 18.803(15) Å, b = 17.490(18) Å, c = 7.633(5) Å
β = 92.71(5)°
β = 92.71(5)°
Ratio:
a:b:c = 1.075 : 1 : 0.436
Unit Cell V:
2,507.42 ų (Calculated from Unit Cell)
Z:
16
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.8 Å | (100) |
| 7.56 Å | (25) |
| 7.22 Å | (21) |
| 4.764 Å | (34) |
| 4.258 Å | (25) |
| 3.697 Å | (22b) |
| 2.630 Å | (29) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Kaňkite
General Appearance of Type Material:
Yellowish-green botryoidal coatings and crusts to 7 mm thick.
Place of Conservation of Type Material:
Charles University, Prague, Czech Republic, 20135.
National Museum of Natural History, Washington, D.C., USA, 144939.
National Museum of Natural History, Washington, D.C., USA, 144939.
Geological Setting of Type Material:
An alteration product of arsenopyrite.
Associated Minerals at Type Locality:
Other Language Names for Kaňkite
Common Associates
Associations Based on Photo Data:
| 7 photos of Kaňkite associated with Scorodite | Fe3+AsO4 · 2H2O |
| 6 photos of Kaňkite associated with Zýkaite | Fe3+4(AsO4)3(SO4)(OH) · 15H2O |
| 2 photos of Kaňkite associated with Pitticite | (Fe, AsO4, H2O) (?) |
| 2 photos of Kaňkite associated with Arsenopyrite | FeAsS |
| 1 photo of Kaňkite associated with Bukovskýite | Fe3+2(AsO4)(SO4)(OH) · 9H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CE. | Monteneroite | Cu2+Mn2+2(AsO4)2 · 8H2O |
| 8.CE. | Belmonteite | CaMn2(AsO4)2 · 7H2O |
| 8.CE.X | Babánekite | Cu3(AsO4)2 · 8H2O |
| 8.CE.05 | Chudobaite | Mg5(AsO4)2(AsO3OH)2 · 10H2O |
| 8.CE.05 | Geigerite | Mn2+5(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.10 | Newberyite | Mg(PO3OH) · 3H2O |
| 8.CE.10 | Manganonewberyite | Mn(PO3OH)(H2O)3 |
| 8.CE.15 | Fanguangite | (MoO2)(PO3OH) · 4H2O |
| 8.CE.15 | Brassite | Mg(HAsO4) · 4H2O |
| 8.CE.20 | Phosphorrösslerite | Mg(PO3OH) · 7H2O |
| 8.CE.20 | Rösslerite | Mg(HAsO4) · 7H2O |
| 8.CE.25 | Switzerite | Mn2+3(PO4)2 · 7H2O |
| 8.CE.25 | Metaswitzerite | Mn2+3(PO4)2 · 4H2O |
| 8.CE.30 | Pradetite | CoCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Klajite | MnCu4(AsO4)2(HAsO4)2 · 9-10H2O |
| 8.CE.30 | Hloušekite | (Ni,Co)Cu4(AsO4)2(AsO3OH)2 · 9H2O |
| 8.CE.30 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.35 | Bobierrite | Mg3(PO4)2 · 8H2O |
| 8.CE.40 | Barićite | (Mg,Fe)3(PO4)2 · 8H2O |
| 8.CE.40 | Parasymplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Gritsenkoite | CoMg2(AsO4)2(H2O)8 |
| 8.CE.40 | Cabrerite | NiMg2(AsO4)2 · 8H2O |
| 8.CE.40 | Pakhomovskyite | Co3(PO4)2 · 8H2O |
| 8.CE.40 | Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O |
| 8.CE.40 | Arupite | Ni3(PO4)2 · 8H2O |
| 8.CE.40 | Erythrite | Co3(AsO4)2 · 8H2O |
| 8.CE.40 | Hörnesite | Mg3(AsO4)2 · 8H2O |
| 8.CE.40 | Manganohörnesite | Mn2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Köttigite | Zn3(AsO4)2 · 8H2O |
| 8.CE.40 | Ferrisymplesite | Fe3+3(AsO4)2(OH)3 · 5H2O |
| 8.CE.40 | Annabergite | Ni3(AsO4)2 · 8H2O |
| 8.CE.45 | Symplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.50 | Cattiite | Mg3(PO4)2 · 22H2O |
| 8.CE.55 | Koninckite | Fe3+PO4 · 3H2O |
| 8.CE.60 | Hilarionite | Fe3+2(SO4)(AsO4)(OH) · 6H2O |
| 8.CE.65 | Steigerite | Al(VO4) · 3H2O |
| 8.CE.70 | Metaschoderite | Al2(PO4)(VO4) · 6H2O |
| 8.CE.70 | Schoderite | Al2(PO4)(VO4) · 8H2O |
| 8.CE.75 | Zigrasite | MgZr(PO4)2 · 4H2O |
| 8.CE.75 | 'UM2009-11-PO:CaHZr' | CaZr[PO4]2 · 4H2O |
| 8.CE.75 | Malhmoodite | FeZr(PO4)2 · 4H2O |
| 8.CE.80 | Santabarbaraite | Fe3+3(PO4)2(OH)3 · 5H2O |
| 8.CE.85 | Metaköttigite | (Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH) |
| 8.CE.90 | Slavkovite | Cu13(AsO4)6(AsO3OH)4 · 23H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Kaňkite
mindat.org URL:
https://www.mindat.org/min-2153.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Kaňkite
Reference List:
Fleischer, Michael, Cabri, Louis J., Nickel, Ernest H., Pabst, Adolf (1977) New Mineral Names. American Mineralogist, 62 (5-6) 593-600
Localities for Kaňkite
Showing 54 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| R Bottrill |
Austria | |
| Blass et al. (1998) +1 other reference |
| Georgian Mining Corporation |
| Majzlan et al. (2021) |
| Bojar (2004) |
Canada | |
| Walker et al. (2009) |
| DeSisto (2009) | |
| Gomi (2001) |
China | |
| Ottens (2011) |
Czech Republic (TL) | |
| Neues Jahrb.Min. (1976) +1 other reference |
| American Mineralogist (1978) | |
| Gramblička (n.d.) |
| Hloušek et al. (2002) |
| Sejkora et al. (2006) |
| Pauliš et al. (2011) |
Europe | |
| Pauliš et al. (2008) |
Finland | |
| Parviainen et al. (2012) |
France | |
| Queneau (n.d.) |
Germany | |
| Walenta (1994) +1 other reference |
| Motzigemba et al. (03/2021) |
| Walenta (1996) |
| Collected by Werner Simon ... |
| Schnorrer-Köhler (1991) | |
| Gröbner et al. (2011) |
| Gröbner et al. (2011) | |
| Desor (05/2020) |
| www.dergraul.de (2001) |
| Lapis 30 (7/8) | |
| Witzke et al. (1993) |
| www.mineralienatlas.de (n.d.) |
| Witzke et al. (1993) |
| Wittern (2001) |
| Witzke et al. (1993) |
Ghana | |
| Craw et al. (2014) |
Greece | |
| Wendel (2000) |
| Rieck et al. (1999) +1 other reference | |
| Jason B. Smith. |
Hungary | |
| GEODA |
Italy | |
| ALBERTINI C. (2014) |
| ALBERTINI C. (2014) |
Japan | |
| Miyamoto et al (1995) |
| Matsubara et al. (2001) |
| Yamada and Matsuyama (1988) |
| KATO et al. (1984) |
New Zealand | |
| Haffert et al. (2010) |
| Kerr et al. (2018) |
North Macedonia | |
| abstract in Geophysical Research ... +1 other reference |
Poland | |
| Siuda (2001) |
| Siuda et al. (2003) |
| Siuda (2014) +1 other reference |
Slovakia | |
| Martin Števko |
Spain | |
| Rodríguez-Vázquez et al. (2012) |
Switzerland | |
| Ansermet S.; Meisser N. (2026) |
UK | |
| Golley et al. (1995) |
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Kaňk, Kutná Hora, Kutná Hora District, Central Bohemian Region, Czech Republic