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Shubnikovite

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Formula:
Ca
 
2
Cu
 
8
(AsO
 
4
)
 
6
(OH)Cl · 7H
 
2
O
Colour:Bright blue
Name:Named after Aleksei Vasilievich Shubnikov (1887-1970), director crystallographic institute, Academy of sciences of the USSR.


A highly questionable mineral (cf. Giester et al., 2007); probably one of the arsenate members of the Lavendulan Group.

Classification of Shubnikovite

IMA status:Questionable/Doubtful
Strunz 8th edition ID:7/D.25-30
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:42.8.8.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : (AB)5(XO4)3Zq·xH2O
Hey's CIM Ref.:22.2.5

22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
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Type Occurrence of Shubnikovite

Type Locality:Khovu-Aksy Ni-Co deposit, Tuva Republic, Eastern-Siberian Region, Russia
Year of Discovery:1953

Physical Properties of Shubnikovite

Colour:Bright blue

Optical Data of Shubnikovite

Type:Biaxial (-)
RI values: nα = 1.640 nβ = 1.690 nγ = 1.690
Maximum Birefringence:δ = 0.050

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:relatively weak

Chemical Properties of Shubnikovite

Formula:
Ca
 
2
Cu
 
8
(AsO
 
4
)
 
6
(OH)Cl · 7H
 
2
O
Essential elements:As, Ca, Cl, Cu, H, O
All elements listed in formula:As, Ca, Cl, Cu, H, O

Relationship of Shubnikovite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DG.05Lavendulan
NaCaCu
 
5
(AsO
 
4
)
 
4
Cl · 5H
 
2
O
8.DG.05Sampleite
NaCaCu
 
5
(PO
 
4
)
 
4
Cl · 5H
 
2
O
8.DG.05Zdenĕkite
NaPbCu
 
5
(AsO
 
4
)
 
4
Cl · 5H
 
2
O
8.DG.05Lemanskiite
NaCaCu
 
5
(AsO
 
4
)
 
4
Cl · 5H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
22.2.1Sampleite
NaCaCu
 
5
(PO
 
4
)
 
4
Cl · 5H
 
2
O
22.2.2Lavendulan
NaCaCu
 
5
(AsO
 
4
)
 
4
Cl · 5H
 
2
O
22.2.3Chlorapatite
Ca
 
5
(PO
 
4
)
 
3
Cl
22.2.4Turneaureite
Ca
 
5
(AsO
 
4
)
 
3
Cl
22.2.6Richelsdorfite
Ca
 
2
Cu
 
5
Sb(AsO
 
4
)
 
4
(OH)
 
6
Cl · 6H
 
2
O
22.2.7Alforsite
Ba
 
5
(PO
 
4
)
 
3
Cl
22.2.8Morelandite
Ca
 
2
Ba
 
3
(AsO
 
4
)
 
3
Cl
22.2.9Pyromorphite
Pb
 
5
(PO
 
4
)
 
3
Cl
22.2.10Mimetite
Pb
 
5
(AsO
 
4
)
 
3
Cl
22.2.11Mimetite-M
Pb
 
5
(AsO
 
4
)
 
3
Cl
22.2.12Sahlinite
Pb
 
14
(AsO
 
4
)
 
2
O
 
9
Cl
 
4
22.2.13Georgiadèsite
Pb
 
4
(AsO
 
3
)Cl
 
4
(OH)
22.2.14Vanadinite
Pb
 
5
(VO
 
4
)
 
3
Cl
22.2.15Kombatite
Pb
 
14
(VO
 
4
)
 
2
O
 
9
Cl
 
4
22.2.16Leningradite
PbCu
 
3
(VO
 
4
)
 
2
Cl
22.2.17Hedyphane
Pb
 
3
Ca
 
2
(AsO
 
4
)
 
3
Cl
22.2.18Nealite
Pb
 
4
Fe
2+
 
(As
3+
 
O
 
3
)
 
2
Cl
 
4
· 2H
 
2
O

Other Names for Shubnikovite

Other Languages:
German:Shubnikovit
Russian:Шубниковит
Spanish:Shubnikovita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Shubnikovite

Reference List:

- +
Nefedov, Ye. (1953), Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 82: 311-317.

American Mineralogist (1055): 40: 552.

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 Shubnikovite

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