Dokuchaevite
A valid IMA mineral species
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Russian geologist and geographer Vasily Vasilyevich Dokuchaev (1846-1903)
Formula:
Cu8O2(VO4)3Cl3
the structural formula is Cu2[Cu6O2](VO4)3Cl3
Colour:
dark red
Lustre:
Adamantine
Hardness:
2
Specific Gravity:
4.142 (Calculated)
Crystal System:
Triclinic
Name:
Named by N.G. Sumin in 1949 after Vasily Vasilyevich Dokuchaev (March 1, 1846 in Milyukovo, Smolensk Governorate – November 8, 1903 in Saint Petersburg) - the Russian geologist and geographer, who is credited with laying the foundations of soil science.
Chemically and somewhat structurally related to yaroshevskite. Also chemically similar to averievite. Compare also leningradite and engelhauptite.
Not to be confused with Dokuchaevite (of Sumin), a variety of delafossite.
New structure type. Very diverse in terms of ligand coordination. The OCu4 tetrahedra share corners to form [O2Cu6]8+ single chains, 3D integrity of which is due to two (of 8 symmetrically independent) Cu atoms that do not form Cu-O bonds with additional oxygen atoms. Cavities bear mixed tetrahedra.
Not to be confused with Dokuchaevite (of Sumin), a variety of delafossite.
New structure type. Very diverse in terms of ligand coordination. The OCu4 tetrahedra share corners to form [O2Cu6]8+ single chains, 3D integrity of which is due to two (of 8 symmetrically independent) Cu atoms that do not form Cu-O bonds with additional oxygen atoms. Cavities bear mixed tetrahedra.
Unique Identifiers
Mindat ID:
52762
Long-form identifier:
mindat:1:1:52762:8
GUID
(UUID V4):
(UUID V4):
8f4e8e03-554c-4da9-8117-3048056014dc
IMA Classification of Dokuchaevite
Approved
Approval year:
2018
First published:
2019
Type description reference:
Classification of Dokuchaevite
8.BB.45
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
B : With only medium-sized cations, (OH, etc.):RO4 about 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
B : With only medium-sized cations, (OH, etc.):RO4 about 1:1
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Dok | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Dokuchaevite
Adamantine
Colour:
dark red
Streak:
reddish black
Hardness:
2 on Mohs scale
Hardness:
VHN100= 55 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none
Fracture:
Irregular/Uneven
Density:
4.142 g/cm3 (Calculated)
Optical Data of Dokuchaevite
Anisotropism:
ΔR589 = 0.85%
Bireflectance:
weak
Reflectivity:
| Wavelength | R1 | R2 |
|---|---|---|
| 400nm | 12.15% | 11.07% |
| 420nm | 12.62% | 11.55% |
| 440nm | 12.97% | 11.92% |
| 460nm | 13.20% | 12.22% |
| 470nm | 13.30% | 12.36% |
| 480nm | 13.40% | 12.50% |
| 500nm | 13.55% | 12.67% |
| 520nm | 13.69% | 12.82% |
| 540nm | 13.79% | 12.94% |
| 546nm | 13.81% | 12.96% |
| 560nm | 13.84% | 13.01% |
| 580nm | 13.88% | 13.03% |
| 589nm | 13.87% | 13.02% |
| 600nm | 13.86% | 13.01% |
| 620nm | 13.83% | 12.96% |
| 640nm | 13.79% | 12.88% |
| 650nm | 13.75% | 12.84% |
| 660nm | 13.71% | 12.79% |
| 680nm | 13.57% | 12.65% |
| 700nm | 13.44% | 12.47% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 13.88%.
R1 shown in black, R2 shown in red
Colour in reflected light:
grey with yellowish tint
Internal Reflections:
yellow-red internal reflections
Pleochroism:
Non-pleochroic
Chemistry of Dokuchaevite
Mindat Formula:
Cu8O2(VO4)3Cl3
the structural formula is Cu2[Cu6O2](VO4)3Cl3
the structural formula is Cu2[Cu6O2](VO4)3Cl3
Elements listed:
Crystallography of Dokuchaevite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 6.332(3) Å, b = 8.204(4) Å, c = 15.562(8) Å
α = 90.498(8)°, β = 91.173(7)°, γ = 90.896(13)°
α = 90.498(8)°, β = 91.173(7)°, γ = 90.896(13)°
Ratio:
a:b:c = 0.772 : 1 : 1.897
Unit Cell V:
801.9 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 15.440 Å | (18) |
| 7.276 Å | (27) |
| 5.596 Å | (43) |
| 4.857 Å | (33) |
| 3.193 Å | (29) |
| 2.791 Å | (30) |
| 2.564 Å | (21) |
| 2.522 Å | (100) |
Comments:
Yadovitaya fumarole, Tolbachik volcano, Russia. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Dokuchaevite
General Appearance of Type Material:
Individual prismatic crystals growing on crusts of various Cu sulphate exhalative minerals.
Place of Conservation of Type Material:
Collections of the Mineralogical Museum, Department of Mineralogy, St Petersburg State University, St Petersburg, Russia, specimen number 1/19664.
Geological Setting of Type Material:
Fumarole.
Associated Minerals at Type Locality:
Reference:
Siidra, O.I., Nazarchuk, E.V., Zaitsev, A.N., Polekhovsky, Y.S., Wenzel, T., Spratt, J. (2019) Dokuchaevite, Cu8O2(VO4)3Cl3, a new mineral with remarkably diverse Cu2+ mixed-ligand coordination environments. Mineralogical Magazine: 83(5): 749-755.
Synonyms of Dokuchaevite
Other Language Names for Dokuchaevite
Russian:Докучаевит
Related Minerals - Strunz-mindat Grouping
| 8.BB. | Tilasite | CaMg(AsO4)F |
| 8.BB.X | Arsenowagnerite | Mg2(AsO4)F |
| 8.BB. | Moabite | NiFe3+(PO4)O |
| 8.BB. | Karlditmarite | Cu9O4(PO4)2(SO4)2 |
| 8.BB. | Milkovoite | Cu4O(PO4)(AsO4) |
| 8.BB. | Paulgrothite | Cu9Fe3+O4(PO4)4Cl3 |
| 8.BB.05 | Amblygonite | LiAl(PO4)F |
| 8.BB.05 | Montebrasite | LiAl(PO4)(OH) |
| 8.BB.05 | Tavorite | LiFe3+(PO4)(OH) |
| 8.BB.10 | Triplite | Mn2+2(PO4)F |
| 8.BB.10 | Zwieselite | Fe2+2(PO4)F |
| 8.BB.15 | Sarkinite | Mn2+2(AsO4)(OH) |
| 8.BB.15 | Triploidite | Mn2+2(PO4)(OH) |
| 8.BB.15 | Wagnerite | (Mg,Fe2+)2(PO4)F |
| 8.BB.15 | Wolfeite | Fe2+2(PO4)(OH) |
| 8.BB.15 | Stanĕkite | (Mn2+,Fe2+,Mg)Fe3+(PO4)O |
| 8.BB.15 | Joosteite | Mn2+(Mn3+,Fe3+)(PO4)O |
| 8.BB.15 | Hydroxylwagnerite | Mg2(PO4)(OH) |
| 8.BB.15 | Unnamed (Sb-analogue of Auriacusite) | Fe3+Cu2+[(Sb,As)O4]O |
| 8.BB.20 | Holtedahlite | Mg2(PO4)(OH) |
| 8.BB.20 | Satterlyite | (Fe2+,Mg,Fe)12(PO4)5(PO3OH)(OH,O)6 |
| 8.BB.25 | Althausite | Mg4(PO4)2(OH,O)(F,◻) |
| 8.BB.30 | Adamite | Zn2(AsO4)(OH) |
| 8.BB.30 | Eveite | Mn2+2(AsO4)(OH) |
| 8.BB.30 | Libethenite | Cu2(PO4)(OH) |
| 8.BB.30 | Olivenite | Cu2(AsO4)(OH) |
| 8.BB.30 | Zincolibethenite | CuZn(PO4)(OH) |
| 8.BB.30 | Zincolivenite | CuZn(AsO4)(OH) |
| 8.BB.30 | Auriacusite | Fe3+Cu2+(AsO4)O |
| 8.BB.35 | Paradamite | Zn2(AsO4)(OH) |
| 8.BB.35 | Tarbuttite | Zn2(PO4)(OH) |
| 8.BB.40 | Barbosalite | Fe2+Fe3+2(PO4)2(OH)2 |
| 8.BB.40 | Hentschelite | CuFe3+2(PO4)2(OH)2 |
| 8.BB.40 | Lazulite | MgAl2(PO4)2(OH)2 |
| 8.BB.40 | Scorzalite | Fe2+Al2(PO4)2(OH)2 |
| 8.BB.40 | Wilhelmkleinite | ZnFe3+2(AsO4)2(OH)2 |
| 8.BB.45 | Trolleite | Al4(PO4)3(OH)3 |
| 8.BB.45 | Yaroshevskite | Cu9O2(VO4)4Cl2 |
| 8.BB.50 | Namibite | Cu(BiO)2(VO4)(OH) |
| 8.BB.50 | Aleutite | [Cu5O2](AsO4)(VO4) · (Cu,K,Pb,Rb,Cs,)Cl |
| 8.BB.52a | Ericlaxmanite | Cu4O(AsO4)2 |
| 8.BB.52b | Kozyrevskite | Cu4O(AsO4)2 |
| 8.BB.55 | Phosphoellenbergerite | (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6 |
| 8.BB.55 | Popovite | Cu5O2(AsO4)2 |
| 8.BB.60 | Urusovite | CuAl(AsO4)O |
| 8.BB.65 | Theoparacelsite | Cu3(As2O7)(OH)2 |
| 8.BB.70 | Turanite | Cu5(VO4)2(OH)4 |
| 8.BB.75 | Stoiberite | Cu5(VO4)2O2 |
| 8.BB.80 | Fingerite | Cu11(VO4)6O2 |
| 8.BB.85 | Averievite | Cu6(VO4)2O2Cl2 |
| 8.BB.90 | Lipscombite | Fe2+Fe3+2(PO4)2(OH)2 |
| 8.BB.90 | Richellite | CaFe3+2(PO4)2(OH,F)2 |
| 8.BB.90 | Zinclipscombite | ZnFe3+2(PO4)2(OH)2 |
Other Information
Notes:
soluble in warm H2O
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 Dokuchaevite
mindat.org URL:
https://www.mindat.org/min-52762.html
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References for Dokuchaevite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) CNMNC Newsletter No 43, New minerals and nomenclature modifications approved in 2018. Mineralogical Magazine, 82 (3) 779-785 doi:10.1180/mgm.2018.72p.783
Localities for Dokuchaevite
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.
Kazakhstan | |
| webmineral.ru (n.d.) |
Russia (TL) | |
| Hålenius et al. (2018) +1 other reference |
| Sumin N.G. (1949) |
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