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Allochalcoselite

Formula:
Cu
+
 
PbCu
2+
5
[O
 
2
|Cl
 
5
|(SeO
 
3
)
 
2
]
System:MonoclinicColour:dark brown
Hardness:3 - 4
Name:for the chemical composition and reflecting the different oxidation states of copper (greek "allo" = different)
This page provides mineralogical data about Allochalcoselite.

Classification of Allochalcoselite

IMA status:Approved 2004
Strunz 8th edition ID:4/K.05-80
Nickel-Strunz 10th (pending) edition ID:4.JG.40

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
G : Selenites with additional anions, without H2O
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Type Occurrence of Allochalcoselite

Type Locality:Second scoria cone, Northern Breakthrough (North Breach), Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia
General Appearance of Type Material:small prismatic crystals up to 0.1 mm long
Geological Setting of type material:volcanic fumarole
Associated Minerals at type locality:
SophiiteIlinskiteGeorgbokiiteCotunniteBurnsite

Physical Properties of Allochalcoselite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent
Colour:dark brown
Hardness (Mohs):3 - 4
Cleavage:Perfect
on {100}
Density (calculated):4.653 g/cm3

Crystallography of Allochalcoselite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
Cell Parameters:a = 18.468Å, b = 6.1475Å, c = 15.314Å
β = 119.284°
Ratio:a:b:c = 3.004 : 1 : 2.491
Unit Cell Volume:V 1516.4 ų
Z:4
X-Ray Powder Diffraction:
d-spacingIntensity
3.08 (100)
3.86 (80)
3.55 (80)
1.543 (50)

Chemical Properties of Allochalcoselite

Formula:
Cu
+
 
PbCu
2+
5
[O
 
2
|Cl
 
5
|(SeO
 
3
)
 
2
]
All elements listed in formula:Cl, Cu, O, Pb, Se
Analytical Data:
CuO (43.96)
ZnO (0.15)
SeO2 (20.66)
Cl (16.58)
PbO (22.34)
less O = Cl2 (3.75)

Relationship of Allochalcoselite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JG.Prewittite
KPb
 
1.5
ZnCu
 
6
[O
 
2
|Cl
 
10
|(SeO
 
3
)
 
2
]
4.JG.05Georgbokiite
Cu
 
5
[O
 
2
|Cl
 
2
|(SeO
 
3
)
 
2
]
4.JG.05Parageorgbokiite
Cu
 
5
[O
 
2
|Cl
 
2
|(SeO
 
3
)
 
2
]
4.JG.10Chloromenite
Cu
 
9
[O
 
2
|Cl
 
6
|(SeO
 
3
)
 
4
]
4.JG.15Sophiite
Zn
 
2
[Cl
 
2
|SeO
 
3
]
4.JG.20Ilinskite
(Na,K)Cu
 
5
[O
 
2
|Cl
 
3
|(SeO
 
3
)
 
2
]
4.JG.25Francisite
Cu
 
3
Bi(SeO
 
3
)
 
2
O
 
2
Cl
4.JG.30Derriksite
Cu
 
4
UO
 
2
(SeO
 
3
)
 
2
(OH)
 
6
·H
 
2
O
4.JG.35Burnsite
KCdCu
2+
7
[O
 
2
|Cl
 
9
|(SeO
 
3
)
 
2
]

Other Names for Allochalcoselite

Synonyms:
IMA2004-025
Other Languages:
German:Allochalcoselit

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 Allochalcoselite

Reference List:P. Vergasova, S. V. Krivovichev, S. N. Britvin, S. K. Filatov, P. C. Burns & V. V. Ananyev: Proc. Russ. Min. Soc. 134(3):70-73 (2005)

Internet Links for Allochalcoselite

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    Localities for Allochalcoselite

    (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'
        • Tolbachik volcano
          • Great Fissure (Main Fracture) eruption
            • Northern Breakthrough (North Breach)
    		P. Vergasova et al.: Proc. Russ. Min. Soc. 134(3):70-73 (2005)
    Mineral and/or Locality
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