Allochalcoselite
A valid IMA mineral species
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About Allochalcoselite
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.
Unique Identifiers
Mindat ID:
27596
Long-form identifier:
mindat:1:1:27596:5
IMA Classification of Allochalcoselite
Classification of Allochalcoselite
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
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
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Acc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Allochalcoselite
Adamantine
Transparency:
Transparent
Colour:
Dark brown
Streak:
Brown
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {100}
on {100}
Density:
4.653 g/cm3 (Calculated)
Optical Data of Allochalcoselite
Type:
Biaxial (+)
RI values:
nα = 1.98(1) nβ = 2.01(1) nγ = 2.08(1)
2V:
Measured: 50° (15), Calculated: 68°
Max. Birefringence:
δ = 0.100
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Optical Extinction:
Y = b, X = c.
Pleochroism:
Visible
Comments:
X = light brown
Y = not determined
Z = reddish-brown
Y = not determined
Z = reddish-brown
Chemistry of Allochalcoselite
Mindat Formula:
Cu+PbCu2+5(SeO3)2Cl5O2
Element Weights:
Crystallography of Allochalcoselite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 18.468(2) Å, b = 6.1475(8) Å, c = 15.314(2) Å
β = 119.284(2)°
β = 119.284(2)°
Ratio:
a:b:c = 3.004 : 1 : 2.491
Unit Cell V:
1516.4 ų
Z:
4
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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View
CIF File Best | x | y | z | a | b | c
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006091 | Allochalcoselite | Krivovichev S V, Filatov S K, Burns P C, Vergasova L P (2006) The crystal structure of allochalcoselite, Cu+Cu2+5PbO2(SeO3)2Cl5, a mineral with well-defined Cu+ and Cu2+ positions The Canadian Mineralogist 44 507-514 |  | 2006 | fumaroles of the Great Tolbachik fissure eruption, Kamchatka Peninsula, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.08 Å | (100) |
| 3.86 Å | (80) |
| 3.55 Å | (80) |
| 1.543 Å | (50) |
| 1.349 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Allochalcoselite
General Appearance of Type Material:
Small prismatic crystals up to 0.1 mm long.
Place of Conservation of Type Material:
n.d.
Geological Setting of Type Material:
Volcanic fumarole,
Associated Minerals at Type Locality:
Synonyms of Allochalcoselite
Other Language Names for Allochalcoselite
Dutch:Allochalcoseliet
French:Allochalcoselite
Norwegian:Allochalcoselitt
Simplified Chinese:氯亚硒酸铅铜石
Traditional Chinese:氯亞硒酸鉛銅石
Related Minerals - Strunz-mindat Grouping
| 4.JG. | Prewittite | KPb1.5ZnCu6(SeO3)2O2Cl10 |
| 4.JG. | Masaitisite | KCu5O2(SeO3)2Cl3 |
| 4.JG. | Wangkuirenite | Pb3Cl2(SeO3)2 |
| 4.JG. | Guangyuanite | Pb3Cl3(Se4+O3)(OH) |
| 4.JG.05 | Georgbokiite | Cu5(SeO3)2O2Cl2 |
| 4.JG.05 | Parageorgbokiite | Cu5(SeO3)2O2Cl2 |
| 4.JG.10 | Chloromenite | Cu9(SeO3)4O2Cl6 |
| 4.JG.15 | Sofiite | Zn2(SeO3)Cl2 |
| 4.JG.20 | Ilinskite | (Na,K)Cu5(SeO3)2O2Cl3 |
| 4.JG.25 | Francisite | Cu3Bi(SeO3)2O2Cl |
| 4.JG.30 | Derriksite | Cu4(UO2)(SeO3)2(OH)6 |
| 4.JG.35 | Burnsite | KCdCu2+7(SeO3)2O2Cl9 |
| 4.JG.45 | Nicksobolevite | Cu7(SeO3)2O2Cl6 |
| 4.JG.50 | Plumboselite | Pb3O2(SeO3) |
| 4.JG.55 | Sarrabusite | Pb5CuCl4(SeO3)4 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Allochalcoselite
mindat.org URL:
https://www.mindat.org/min-27596.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Allochalcoselite
Reference List:
Ercit, T. S.; Piilonen, P.C.; Locock, A.J.; Kolitsch, U.; Rowe, R. (2006) New mineral names. American Mineralogist, 91 (7). 1201-1209 doi:10.2138/am.2006.467
Krivovichev, S. V., Filatov, S. K., Burns, P. C., Vergasova, L. P. (2006) The crystal structure of allochalcoselite, Cu+Cu2+5PbO2(SeO3)2Cl5, a mineral with well-defined Cu+ and Cu2+ positions. The Canadian Mineralogist, 44 (2) 507-514 doi:10.2113/gscanmin.44.2.507
Localities for Allochalcoselite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Vergasova et al. (2005) +1 other reference |
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Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia