Shubnikovite
A valid IMA mineral species - grandfathered - questionable
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About Shubnikovite
Aleksei V. Shubnikov
Formula:
Ca2Cu8(AsO4)6(OH)Cl · 7H2O
Colour:
Bright blue, light blue
Hardness:
2
Crystal System:
Orthorhombic
Name:
Named in honor of Aleksei Vasilievich Shubnikov (Алексе́й Васи́льевич Шу́бников) (29 March 1887, Moscow, Russian Empire - 27 April 1970, USSR), director of the Crystallographic Institute, Academy of Sciences, Moscow. He was considered one of the greatest crystallographers of his time; in particular, he developed the theory of antisymmetry. He helped initiate the International Union of Crystallography, wrote several important books and was known for his excellent lectures.
A highly questionable mineral (cf. Giester et al., 2007); probably one of the arsenate members of the Lavendulan Group.
Unique Identifiers
Mindat ID:
3641
Long-form identifier:
mindat:1:1:3641:8
GUID
(UUID V4):
(UUID V4):
08f7650b-8025-478a-9994-5854012836ee
IMA Classification of Shubnikovite
Approved, 'Grandfathered' (first described prior to 1959), Questionable
IMA Formula:
Ca2Cu8(AsO4)6Cl(OH) · 7H2O (?)
Classification of Shubnikovite
8.DG.05
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
G : With large and medium-sized cations, (OH, etc.):RO4< 0.5:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
G : With large and medium-sized cations, (OH, etc.):RO4< 0.5:1
42.8.8.1
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : (AB)5(XO4)3Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : (AB)5(XO4)3Zq·xH2O
22.2.5
22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
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 |
|---|---|---|
| Snk | 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 Shubnikovite
Transparency:
Translucent
Colour:
Bright blue, light blue
Hardness:
2 on Mohs scale
Comment:
3.38 (unclear if this is measured or calculated)
Optical Data of Shubnikovite
Type:
Biaxial (-)
RI values:
nα = 1.640 nβ = 1.690 nγ = 1.690
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively weak
Pleochroism:
Visible
Comments:
X light blue, Y:Z greenish-blue
Chemistry of Shubnikovite
Mindat Formula:
Ca2Cu8(AsO4)6(OH)Cl · 7H2O
Crystallography of Shubnikovite
Crystal System:
Orthorhombic
Comment:
Questionable
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47e : [Vanadates, chromates, manganates] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Shubnikovite
General Appearance of Type Material:
Platey
Place of Conservation of Type Material:
Mining Institute, St. Petersburg, 456/1-3.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 57262.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 57262.
Geological Setting of Type Material:
Found in oxidation zone
Other Language Names for Shubnikovite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.DG. | Jasonsmithite | Mn2+4ZnAl(PO4)4(OH)(H2O)7 · 3.5H2O |
| 8.DG. | Davidbrownite-(NH4) | (NH4)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4 · 3H2O |
| 8.DG. | Relianceite-(K) | K4Mg(V4+O)2(C2O4)(PO3OH)4(H2O)10 |
| 8.DG. | Pleysteinite | [(H2O)0.5K0.5]2Mn2Al3(PO4)4F2 · 14H2O |
| 8.DG. | Rewitzerite | [K(H2O)]Mn2Al3(PO4)4(OH)2 · 14H2O |
| 8.DG.05 | Lavendulan | NaCaCu5(AsO4)4Cl · 5H2O |
| 8.DG.05 | Sampleite | NaCaCu5(PO4)4Cl · 5H2O |
| 8.DG.05 | Zdenĕkite | NaPbCu5(AsO4)4Cl · 5H2O |
| 8.DG.05 | Lemanskiite | NaCaCu5(AsO4)4Cl · 3H2O |
Other Information
Notes:
Easily fusible, soluble in acids
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 Shubnikovite
mindat.org URL:
https://www.mindat.org/min-3641.html
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References for Shubnikovite
Reference List:
Localities for Shubnikovite
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.
Germany | |
| Baumann et al. (03/2021) |
Greece | |
| Wendel (2000) +1 other reference |
Italy | |
| Fernando Caboni et al. (2024) |
| Fernando Caboni et al. (2024) |
Russia (TL) | |
| Pekov (1998) |
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