Mineralogy Database

Allochalcoselite Mineral Data

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General Allochalcoselite Information

Help on Chemical  Formula: Chemical Formula: Cu+Cu++5PbO2(SeO3)2Cl5
Help on Composition: 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
               -   %   Cl   -3.78 % -O=Cl2   
   Oxygen    12.05 %  O
            ______        ______ 
            100.00 %       99.96 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CuCu4.92Pb1.07Se1.99O7.99Cl5.01
Help on Environment: Environment: Found among lead and copper selenite-chloride exhalative products associated with the fumaroles.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Second cinder cone of the northern breach of the Great Tolbachik Fissure Eruption, Kamchatka Region, Russia. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Synonym: Synonym: IMA2004-025

Allochalcoselite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.0041:1:2.491
Help on Cell Dimensions: Cell Dimensions: a = 18.468, b = 6.1475, c = 15.314, Z = 4; beta = 119.284° V = 1,516.44 Den(Calc)= 4.64
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: 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,),

Physical Properties of Allochalcoselite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Dark brown.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: brown

Optical Properties of Allochalcoselite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.092 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2205,KC= 0.202
Ncalc = 1.94
Help on Optical Data: Optical Data: Biaxial (+), a=1.98, b=2.01, g=2.08, bire=0.1000

Calculated Properties of Allochalcoselite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.17 gm/cc
note: Specific Gravity of Allochalcoselite =4.64 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEAllochalcoselite = 386.78 barns/electron
U=PEAllochalcoselite x rElectron Density=1,611.67 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Allochalcoselite is Not Radioactive

Allochalcoselite Classification

Help on  Dana Class: Dana Class: (34)Selenites - Tellurites - Sulfites
  (34.06)Dana Type
  (34.06.10)Dana Group Allochalcoselite! CuCu5PbO2(SeO3)2Cl5 C 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AmMin, v91, p1201) PHYS. PROP.(AmMin, v91, p1201) OPTIC PROP.(AmMin, v91, p1201)
Help on See Also: 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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Dana No: Strunz No: 04.JG.40





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