Allochalcoselite Mineral Data (original) (raw)
General Allochalcoselite Information
Chemical Formula:
Cu+Cu++5PbO2(SeO3)2Cl5
Composition:
Molecular Weight = 1,060.48 gm
Copper 35.47 % Cu 6.75 % Cu2O / 36.90 % CuO
Lead 20.91 % Pb 22.52 % PbO
Selenium 14.82 % Se 20.82 % SeO2
Chlorine 16.75 % Cl 16.75 % Cl
Oxygen 12.05 % O
______ ______
100.00 % 99.96 % = TOTAL OXIDE
Empirical Formula:
CuCu4.92Pb1.07Se1.99O7.99Cl5.01
Environment:
Found among lead and copper selenite-chloride exhalative products associated with the fumaroles.
IMA Status:
Approved IMA 2004 (Dana # Added)
Locality:
Second cinder cone of the northern breach of the Great Tolbachik Fissure Eruption, Kamchatka Region, Russia. Link to MinDat.org Location Data.
Name Origin:
The name is compositional and is derived from the Greek, a???? ("different") + ?a???? ("copper") + se??'??("selenium"), to reflect the different valences and crystallographic behavi or of copper in this selenite mineral.
Synonym:
IMA2004-025
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Allochalcoselite Crystallography
Axial Ratios:
a:b:c =3.0041:1:2.491
Cell Dimensions:
a = 18.468, b = 6.1475, c = 15.314, Z = 4; beta = 119.284° V = 1,516.44 Den(Calc)= 4.64
Crystal System:
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
X Ray Diffraction:
By Intensity(I/Io): 3.08(1)(602,020 ), 3.55(0.8)(311 ), 3.86(0.8)(113 ),1.543(0.5)(441, 12.0), 1.348(0.4), 1.448(0.3)(8.2.10 ), 1.71(0.3)(334,828,),
Crystal Structure:
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| | Krivovichev S V , Filatov S K , Burns P C , Vergasova L P , The Canadian Mineralogist , 44 (2006) p.507-514, The crystal structure of allochalcoselite, Cu+Cu2+5PbO2(SeO3)2Cl5,, a mineral with well-defined Cu+ and Cu2+ positions, Locality: fumaroles of the Great Tolbachik fissure eruption, Kamchatka Peninsula, Russia | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Allochalcoselite
Cleavage:
{100} Perfect
Color:
Dark brown.
Diaphaneity:
Translucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Encrustations - Forms crust-like aggregates on matrix.
Hardness:
3-4 - Calcite-Fluorite
Luster:
Adamantine
Streak:
brown
Optical Properties of Allochalcoselite
Gladstone-Dale:
CI calc= -0.092 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2205,KC= 0.202
Ncalc = 1.94
Optical Data:
Biaxial (+), a=1.98, b=2.01, g=2.08, bire=0.1000
Calculated Properties of Allochalcoselite
Electron Density:
Bulk Density (Electron Density)=4.17 gm/cc
note: Specific Gravity of Allochalcoselite =4.64 gm/cc.
Fermion Index:
Fermion Index = 0.05
Boson Index = 0.95
Photoelectric:
PEAllochalcoselite = 386.78 barns/electron
U=PEAllochalcoselite x rElectron Density=1,611.67 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Allochalcoselite is Not Radioactive
Allochalcoselite Classification
Dana Class:
34.06.10.01 (34)Selenites - Tellurites - Sulfites
(34.06)Dana Type
(34.06.10)Dana Group
34.06.10.01 Allochalcoselite! CuCu5PbO2(SeO3)2Cl5 C 2/m 2/m
Strunz Class:
04.JG.40 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
04.JG -Selenites with additional anions, without H2O
04.JG.40 Allochalcoselite! CuCu5PbO2(SeO3)2Cl5 C 2/m 2/m
Other Allochalcoselite Information
References:
NAME( AmMin, v91, p1201) PHYS. PROP.(AmMin, v91, p1201) OPTIC PROP.(AmMin, v91, p1201)
See Also:
Links to other databases for Allochalcoselite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Allochalcoselite Specimen Label here :
Allochalcoselite
Cu+Cu++5PbO2(SeO3)2Cl5
Dana No: 34.06.10.01 Strunz No: 04.JG.40
Locality:
Notes: