Allochalcoselite Mineral Data

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

- % Cl -3.78 % -O=Cl₂

Oxygen 12.05 % O

______ ______

100.00 % 99.96 % = TOTAL OXIDE

Empirical Formula:

CuCu_4.92Pb_1.07Se_1.99O_7.99Cl_5.01

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_{Allochalcoselite}= 386.78 barns/electron
U=PE_{Allochalcoselite} 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: