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Allochalcoselite

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Formula:
Cu
+
 
PbCu
2+
5
(SeO
 
3
)
 
2
Cl
 
5
O
 
2
System:MonoclinicColour:dark brown
Hardness:3 - 4
Name:The name is derived from the Greek άλλος ("allos"), for "different", χαλκός ("chalkos") for "copper" and the element SELenium, to reflect the different valences and crystallographic behavior of copper in this mineral.
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)
1.349 (40)

Chemical Properties of Allochalcoselite

Formula:
Cu
+
 
PbCu
2+
5
(SeO
 
3
)
 
2
Cl
 
5
O
 
2
Essential elements:Cl, Cu, O, Pb, Se
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
(SeO
 
3
)
 
2
O
 
2
Cl
 
10
4.JG.05Georgbokiite
Cu
 
5
(SeO
 
3
)
 
2
O
 
2
Cl
 
2
4.JG.05Parageorgbokiite
Cu
 
5
(SeO
 
3
)
 
2
O
 
2
Cl
 
2
4.JG.10Chloromenite
Cu
 
9
(SeO
 
3
)
 
4
O
 
2
Cl
 
6
4.JG.15Sophiite
Zn
 
2
(SeO
 
3
)Cl
 
2
4.JG.20Ilinskite
(Na,K)Cu
 
5
(SeO
 
3
)
 
2
O
 
2
Cl
 
3
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
(SeO
 
3
)
 
2
O
 
2
Cl
 
9

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

    Hide Locality List
    (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)
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