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Shubnikovite

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About ShubnikoviteHide

Aleksei V. Shubnikov
Formula:
Ca2Cu8(AsO4)6(OH)Cl · 7H2O
Colour:
Bright blue, light blue
Hardness:
2
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.


Classification of ShubnikoviteHide

Approved, 'Grandfathered' (first described prior to 1959), Questionable
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
42.8.8.1

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

Physical Properties of ShubnikoviteHide

Transparency:
Translucent
Colour:
Bright blue, light blue
Hardness:
Comment:
3.38 (unclear if this is measured or calculated)

Optical Data of ShubnikoviteHide

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.
Surface Relief:
High
Dispersion:
relatively weak
Comments:
X light blue, Y:Z greenish-blue

Chemical Properties of ShubnikoviteHide

Formula:
Ca2Cu8(AsO4)6(OH)Cl · 7H2O
IMA Formula:
Ca2Cu8(AsO4)6Cl(OH) · 7H2O (?)

Type Occurrence of ShubnikoviteHide

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.
Geological Setting of Type Material:
Found in oxidation zone

Other Language Names for ShubnikoviteHide

Related Minerals - Nickel-Strunz GroupingHide

8.DG.05LavendulanNaCaCu5(AsO4)4Cl · 5H2OMon. 2/m
8.DG.05SampleiteNaCaCu5(PO4)4Cl · 5H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
8.DG.05ZdenĕkiteNaPbCu5(AsO4)4Cl · 5H2OMon. 2/m : P21/b
8.DG.05LemanskiiteNaCaCu5(AsO4)4Cl · 5H2OTet. 4 2 2 : P41 2 2

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.2.1SampleiteNaCaCu5(PO4)4Cl · 5H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
22.2.2LavendulanNaCaCu5(AsO4)4Cl · 5H2OMon. 2/m
22.2.3ChlorapatiteCa5(PO4)3ClHex. 6/m : P63/m
22.2.4TurneaureiteCa5(AsO4)3ClHex.
22.2.6RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2OMon. 2/m
22.2.7AlforsiteBa5(PO4)3ClHex. 6/m : P63/m
22.2.8MorelanditeCa2Ba3(AsO4)3Cl
22.2.9PyromorphitePb5(PO4)3ClHex. 6/m : P63/m
22.2.10MimetitePb5(AsO4)3ClHex. 6/m : P63/m
22.2.11Mimetite-MPb5(AsO4)3ClMon. 2/m : P21/b
22.2.12SahlinitePb14(AsO4)2O9Cl4Mon.
22.2.13GeorgiadèsitePb4(AsO3)Cl4(OH)Mon.
22.2.14VanadinitePb5(VO4)3ClHex. 6/m : P63/m
22.2.15KombatitePb14(VO4)2O9Cl4Mon.
22.2.16LeningraditePbCu3(VO4)2ClOrth. mmm (2/m 2/m 2/m) : Ibam
22.2.17HedyphaneCa2Pb3(AsO4)3ClHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
22.2.18NealitePb4Fe2+(As3+O3)2Cl4 · 2H2OTric. 1 : P1

Other InformationHide

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.

References for ShubnikoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nefedov, Ye. (1953) Report on new minerals discovered by him p.317 in V. A. Mokievsky. The scientific session of the Federov Institute together with the All-Union Mineralogical Society. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 82: 311-317.
Fleischer, M. (1955) New mineral names. American Mineralogist: 40: 551-554.
Fleischer, M. (1956) New mineral names. American Mineralogist: 41: 671-674.
Giester, Gerald; Uwe Kolitsch; Peter Leverett; Peter Turner; Peter A. Williams (2007) The crystal structures of lavendulan, sampleite, and a new polymorph of sampleite. European Journal of Mineralogy: 19: 75-93.

Internet Links for ShubnikoviteHide

Localities for ShubnikoviteHide

ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium; Lavreotiki Municipality)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
            • Hilarion area
Wendel, W. (2000): Lavrion-News 2000. Lapis 25 (10), 45-47.; J. Gröbner und U. Kolitsch (2002): Neufunde von Laurion aus den Jahren 2001 und 2002. Aufschluss 53 (5-6), 363-371.
Russia (TL)
 
  • Tuva Republic
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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