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Mutnovskite

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Formula:
Pb
 
4
As
 
2
S
 
6
ICl
System:OrthorhombicColour:ruby, dark red to blue
Hardness:2
Name:For the type locality
This page provides mineralogical data about Mutnovskite.

Classification of Mutnovskite

IMA status:Approved 2004
Nickel-Strunz 10th (pending) edition ID:2.GC.50

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
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Type Occurrence of Mutnovskite

Type Locality:Mutnovsky volcano, Kamchatka Oblast', Far-Eastern Region, Russia
General Appearance of Type Material:microscopic short-prismatic crystals up to 100 μm across
Geological Setting of type material:high-temperature fumarole
Associated Minerals at type locality:
PyriteCristobaliteAnhydrite

Physical Properties of Mutnovskite

Diaphaneity (Transparency):Opaque
Colour:ruby, dark red to blue
Hardness (Mohs):2
Tenacity:Fragile
Cleavage:None Observed
Fracture:None observed

Crystallography of Mutnovskite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnma {P21/n 21/m 21/a}
Cell Parameters:a = 11.543Å, b = 6.6764Å, c = 9.359Å
Ratio:a:b:c = 1.729 : 1 : 1.402
Unit Cell Volume:V 721.3 ų
Z:4
X-Ray Powder Diffraction:
d-spacingIntensity
4.69 (32)
4.37 (67)
3.34 (73)
3.19 (100)
2.715 (61)
2.648 (66)
2.539 (31)
2.455 (29)
1.894 (30)
Comments:Format: d/Å (I/%) (hkl)

Chemical Properties of Mutnovskite

Formula:
Pb
 
4
As
 
2
S
 
6
ICl
Essential elements:As, Cl, I, Pb, S
All elements listed in formula:As, Cl, I, Pb, S
Analytical Data:average values out of four electron microprobe analyses
calculated formula based on a total of 7 atoms
Pb (62.0)
As (11.0)
Bi (0.6)
S (14.4)
Se (0.2)
I (8.9)
Cl (2.44)
Br (1.1)
Cu (0.03)
Fe (0.01)

sum 100.7 wt.-%
Empirical Formula:
Pb
 
1.99
(As
 
0.98
Bi
 
0.02
)
 
Σ1.00
(S
 
2.98
Se
 
0.02
)
 
Σ3.00
(I
 
0.47
Cl
 
0.46
Br
 
0.09
)
 
Σ1.02
Common Impurities:Fe,Cu,Se,Bi

Relationship of Mutnovskite to other Species

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.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.40eBabkinite
Pb
 
2
Bi
 
2
(S,Se)
 
3
2.GC.40dSaddlebackite
Pb
 
2
Bi
 
2
Te
 
2
S
 
3
2.GC.45Tvalchrelidzeite
Hg
 
3
SbAsS
 
3

Other Names for Mutnovskite

Synonyms:
IMA2004-032
Other Languages:
German:Mutnovskit
Russian:Мутновскит

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 Mutnovskite

Reference List:

- +
Zelenski, M., Balić-Žunić, T., Bindi, L., Garavelli, A., Makovický, E., Pinto, D., Vurro, F. (2006): First occurrence of iodine in natural sulfosalts: The case of mutnovskite, Pb2AsS3(I,Cl,Br), a new mineral from Mutnovsky volcano, Kamchatka Peninsula, Russian Federation. American Mineralogist 91, 21-28.

L. Bindi, A.Garavelli, D. Pinto, G.Pratesi and F. Vurro (2008): Ordered distribution of I and Cl in the low-temperature crystal structure of mutnovskite, Pb4As2S6ICl: An X-ray single-crystal study: J. Solid State Chem. 18, 306-312.

Internet Links for Mutnovskite

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    • Localities for Mutnovskite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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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
      • Kamchatka Oblast'
    		M. Zelenski et al.: Am. Min. 91:21-28 (2006); American Mineralogist, Volume 94, pages 1312–1324, 2009
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