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Chukanovite

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Dr. Nikita V. Chukanov
Formula:
Fe22+(CO3)(OH)2
System:
Monoclinic
Colour:
pale green or colourless ...
Hardness:
3½ - 4
Name:
Honours Nikita V. Chukanov (b. 1953), Russian physicist and mineralogist, a specialist in infrared spectroscopy.
The Fe analogue of malachite.

Product of terrestrial alteration of meteorite iron. Also observed as an anthropogenic corrosion product in the hot-water exchanger of an industrial plant in Beringen, Switzerland (Erdös & Altorfer, 1976). A synthetic analogue was also obtained as a product of Fe-clay interactions during simulated cooling of containers in radioactive waste repositories (Pignatelli et al., 2014).

Classification of Chukanovite

Approved
Approval Year:
2005
5.BA.10

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
16a.3.2.2

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)2(XO3)Zq
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http://www.mindat.org/min-28917.html
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Type Occurrence of Chukanovite

General Appearance of Type Material:
acicular to fibrous crystals, up to 0.5 mm long and max. 2-3 μm thick, in spherulites up to 1 mm in diameter, also in botryoidal spherulitic clusters and parallel-columnar or radial-columnar aggregates forming crusts up to 1 mm thick
Geological Setting of Type Material:
Terrestrialized (weathered) iron meteorite.

Physical Properties of Chukanovite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
pale green or colourless (unaltered) to brownish green (at the surface) and brown
Comment:
turns brown by oxidation within a few months
Streak:
white
Hardness (Mohs):
3½ - 4
Tenacity:
Brittle
Cleavage:
Perfect
probably in {021}
Fracture:
Irregular/Uneven
Density:
3.60 g/cm3 (Calculated)

Crystallography of Chukanovite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group Setting:
P21/a
Cell Parameters:
a = 9.639Å, b = 12.226Å, c = 6.492Å
β = 96.06°
Ratio:
a:b:c = 0.788 : 1 : 0.531
Unit Cell Volume:
V 760.78 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
d-spacingIntensity
6.14 (40)
5.15 (60)
3.73 (80)
2.645 (100)
2.361 (40)
2.171 (40)

Optical Data of Chukanovite

Type:
Biaxial (-)
RI values:
nα = 1.673(3) nβ = 1.770(5) nγ = 1.780(5)
2V:
Measured: 10° (5)
Max Birefringence:
δ = 0.107
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of Chukanovite

Formula:
Fe22+(CO3)(OH)2
All elements listed in formula:
Analytical Data:
Electron microprobe, mean, wt.%, water by modified Penfield method, CO2 by selective sorption
MgO 0.1
FeO 68.8
NiO 0.6
CO2 19.8
H2O 10.9

total 100.2
Empirical Formula:
(Fe2+1.97Ni0.02Mg0.01)Σ2.00(CO3)0.93(OH)2.14·0.18H2O

Relationship of Chukanovite to other Species

5.BA.05AzuriteCu3(CO3)2(OH)2
5.BA.10GeorgeiteCu2(CO3)(OH)2 · 6H2O
5.BA.10Glaukosphaerite(Cu,Ni)2(CO3)(OH)2
5.BA.10Kolwezite(Cu,Co)2(CO3)(OH)2
5.BA.10MalachiteCu2(CO3)(OH)2
5.BA.10Mcguinnessite(Mg,Cu)2(CO3)(OH)2
5.BA.10NullaginiteNi2(CO3)(OH)2
5.BA.10PokrovskiteMg2(CO3)(OH)2
5.BA.10Rosasite(Cu,Zn)2(CO3)(OH)2
5.BA.10Zincrosasite(Zn,Cu)2(CO3)(OH)2
5.BA.15Aurichalcite(Zn,Cu)5(CO3)2(OH)6
5.BA.15HydrozinciteZn5(CO3)2(OH)6
5.BA.20HoldawayiteMn6(CO3)2(OH)7(Cl,OH)
5.BA.25DeferniteCa6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5)
5.BA.25UM1977-03-COSiO:CaClHCa10-11(CO3)7(SiO4)Cl1-2(OH)1-2
5.BA.30Loseyite(Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10
5.BA.30Sclarite(Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10

Other Names for Chukanovite

Name in Other Languages:
Simplified Chinese:铁孔雀石

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.

References for Chukanovite

Reference List:
Erdös, E. & Altorfer, H. (1976): Werkstoffe und Korrosion: 27: 304-312.

Pekov, I.V., Perchiazzi, N., Merlino, S., Kalachev, V.N., Merlini, M., Aleksandr E. Zadov, A.E. (2007): Chukanovite, Fe2(CO3)(OH)2, a new mineral from the weathered iron meteorite Dronino. European Journal of Mineralogy: 19: 891-898.

Pignatelli, I., Mugnaioli, E., Mosser-Ruck, R., Barres, O., Kolb, U., Michau, N. (2014): A multi-technique, micrometer- to atomic-scale description of a synthetic analogue of chukanovite, Fe2(CO3)(OH)2. European Journal of Mineralogy: 26(2): 221-229.

Internet Links for Chukanovite

Localities for Chukanovite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Russia (TL)
 
  • North-Western Region
    • Ryazanskaya Oblast'
      • Kasimov District
IMA website; Pekov, I.V. et al (2007) European Journal of Mineralogy, 19, 891-898.
Mineral and/or Locality  
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