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Allochalcoselite

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About AllochalcoseliteHide

Formula:
Cu+PbCu2+5(SeO3)2Cl5O2
Colour:
dark brown
Lustre:
Adamantine
Hardness:
3 - 4
Specific Gravity:
4.653 (Calculated)
Crystal System:
Monoclinic
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 AllochalcoseliteHide

Approved
Approval Year:
2004
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

Physical Properties of AllochalcoseliteHide

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

Optical Data of AllochalcoseliteHide

Type:
Biaxial (+)
RI values:
nα = 1.980(1) nβ = 2.010(1) nγ = 2.080(1)
2V:
Measured: 35° to 65°, Calculated: 58° to 78°
Max Birefringence:
δ = 0.100
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Visible
Comments:
X = light brown
Y = not determined
Z = reddish-brown

Chemical Properties of AllochalcoseliteHide

Formula:
Cu+PbCu2+5(SeO3)2Cl5O2
IMA Formula:
Cu1+Cu2+5PbO2(SeO3)2Cl5

Crystallography of AllochalcoseliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 18.468 Å, b = 6.1475 Å, c = 15.314 Å
β = 119.284°
Ratio:
a:b:c = 3.004 : 1 : 2.491
Unit Cell V:
1516.4 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.08 Å(100)
3.86 Å(80)
3.55 Å(80)
1.543 Å(50)
1.349 Å(40)

Type Occurrence of AllochalcoseliteHide

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:

Synonyms of AllochalcoseliteHide

Other Language Names for AllochalcoseliteHide

Related Minerals - Nickel-Strunz GroupingHide

4.JG.PrewittiteKPb1.5ZnCu6(SeO3)2O2Cl10Orth. mmm (2/m 2/m 2/m) : Pnnm
4.JG.05GeorgbokiiteCu5(SeO3)2O2Cl2Mon.
4.JG.05ParageorgbokiiteCu5(SeO3)2O2Cl2Mon. 2/m : P21/b
4.JG.10ChloromeniteCu9(SeO3)4O2Cl6Mon.
4.JG.15SofiiteZn2(SeO3)Cl2Orth.
4.JG.20Ilinskite(Na,K)Cu5(SeO3)2O2Cl3Orth. mmm (2/m 2/m 2/m) : Pnma
4.JG.25FrancisiteCu3Bi(SeO3)2O2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
4.JG.30DerriksiteCu4(UO2)(SeO3)2(OH)6Orth.
4.JG.35BurnsiteKCdCu2+7(SeO3)2O2Cl9Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc

Other InformationHide

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

References for AllochalcoseliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 AllochalcoseliteHide

Localities for AllochalcoseliteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Kamchatka Krai
    • Tolbachik volcano
      • Great Fissure eruption (Main Fracture)
        • Northern Breakthrough (North Breach)
P. Vergasova et al.: Proc. Russ. Min. Soc. 134(3):70-73 (2005)
 
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