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Babkinite

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Formula:
Pb
 
2
Bi
 
2
(S,Se)
 
3
System:TrigonalColour:Silvery grey
Lustre:MetallicHardness:2
Member of:Aleksite Group
Name:For P. V. Babkin (1929-1977), noted Russian Geologist and the first investigator of the Nevskoye deposit.


Aleksite Group.

Classification of Babkinite

IMA status:Approved
Strunz 8th edition ID:2/D.12-60
Nickel-Strunz 10th (pending) edition ID:2.GC.40e

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
Dana 8th edition ID:2.6.3.

2 : SULFIDES
6 : AmBnXp, with (m+n):p = 4:3
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Type Occurrence of Babkinite

Type Locality:Nevskoe (Nevskoye; Nevskoje) W-Sn Deposit, Omsukchan, Ducat District, Kolyma River Basin, Magadanskaya Oblast', Far-Eastern Region, Russia
General Appearance of Type Material:As thin tablets, in aggregates, to 2 mm across.
Place of Conservation of Type Material:A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, p806/1.
Geological Setting of type material:In a hydrothermal deposit in sediments, near their contact with a granite intrusion.
Associated Minerals at type locality:
ArsenopyriteStanniteTetrahedriteWittiteLaitakarite
CosaliteCassiteriteWolframite

Physical Properties of Babkinite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Silvery grey
Streak:Grey
Hardness (Mohs):2
Hardness (Vickers):VHN10=71 - 91 kg/mm2
Cleavage:Perfect
on {0001}
Density (calculated):8.096 g/cm3

Crystallography of Babkinite

Crystal System:Trigonal
Cell Parameters:a = 4.191(2) Å, c = 39.60(3) Å
Ratio:a:c = 1 : 9.449
Unit Cell Volume:V 602.37 ų (Calculated from Unit Cell)
Z:3
Comment:Space group P-31m or P-3.
X-Ray Powder Diffraction:
d-spacingIntensity
3.42 (5)
3.04 (10)
2.096 (8)
1.806 (6)
1.725 (5)
1.298 (7)
1.233 (6)

Optical Data of Babkinite

Type:Anisotropic
Anisotropism:Distinct
Reflectivity:
400nmR=51.3%
420nmR=50.7%
440nmR=49.6%
460nmR=48.7%
480nmR=48.6%
500nmR=48.5%
520nmR=47.8%
540nmR=47.5%
560nmR=48.2%
580nmR=47.0%
600nmR=46.5%
620nmR=46.5%
640nmR=46.1%
660nmR=46.5%
680nmR=46.2%
700nmR=46.7%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 51.3%.
Colour in reflected light:White with yellowish tint
Pleochroism:Weak
Comments:in pale bluish brown tints

Chemical Properties of Babkinite

Formula:
Pb
 
2
Bi
 
2
(S,Se)
 
3
Essential elements:Bi, Pb, S
All elements listed in formula:Bi, Pb, S, Se
Analytical Data:Nevskoye deposit, Russia; by electron microprobe.
Ag (0.13)
Pb (42.58)
Sb (0.08)
Bi (42.02)
Se (10.60)
S (5.80)
Total (101.21)
Empirical Formula:
(Pb
 
1.99
Ag
 
0.01
)(Bi
 
1.95
Sb
 
0.01
)(S
 
1.75
Se
 
1.30
)

Relationship of Babkinite to other Species

Member of:Aleksite Group
Other Members of Group:

- +
Aleksite
PbBi
 
2
Te
 
2
S
 
2
Kochkarite
PbBi
 
4
Te
 
7
Poubaite
PbBi
 
2
(Se,Te,S)
 
4
Rucklidgeite
(Bi,Pb)
 
3
Te
 
4
Saddlebackite
Pb
 
2
Bi
 
2
Te
 
2
S
 
3
Related Minerals - Nickel-Strunz Grouping):

- +
2.GC.05Hatchite
AgTlPbAs
 
2
S
 
5
2.GC.05Wallisite
(Cu,Ag)TlPbAs
 
2
S
 
5
2.GC.10Sinnerite
Cu
 
6
As
 
4
S
 
9
2.GC.15Watanabeite
Cu
 
4
(As,Sb)
 
2
S
 
5
2.GC.20Simonite
TlHgAs
 
3
S
 
6
2.GC.25Quadratite
Ag(Cd,Pb)AsS
 
3
2.GC.25Manganoquadratite
AgMnAsS
 
3
2.GC.30Smithite
AgAsS
 
2
2.GC.35Trechmannite
AgAsS
 
2
2.GC.40aAleksite
PbBi
 
2
Te
 
2
S
 
2
2.GC.40bKochkarite
PbBi
 
4
Te
 
7
2.GC.40cPoubaite
PbBi
 
2
(Se,Te,S)
 
4
2.GC.40cRucklidgeite
(Bi,Pb)
 
3
Te
 
4
2.GC.40dSaddlebackite
Pb
 
2
Bi
 
2
Te
 
2
S
 
3
2.GC.45Tvalchrelidzeite
Hg
 
3
SbAsS
 
3
2.GC.50Mutnovskite
Pb
 
4
As
 
2
S
 
6
ICl

Other Names for Babkinite

Synonyms:
IMA1994-030
Other Languages:
German:Babkinit
Spanish:Babkinita

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 Babkinite

Reference List:

- +
Mineralogical Record: 28: 219.

Bryzgalov, I.A., Spiridonov, E.M., Petrova, I.V. and Sakharova, M.S. (1996): Babkinite Pb2Bi2(S, Se)3 – a new mineral. Doklady Akademii Nauk SSSR, 346(5), 656-659.

Internet Links for Babkinite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Babkinite details from Handbook of Mineralogy (PDF)
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    • Localities for Babkinite

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    (TL) indicates type locality. ? 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
     
    • Far-Eastern Region
      • Magadanskaya Oblast'
        • Kolyma River Basin
          • Ducat District
            • Omsukchan
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
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