Georgbokiite Mineral Data

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General Georgbokiite Information

Chemical Formula:

Cu5O2(SeO3)2Cl2

Composition:

Molecular Weight = 674.55 gm

Copper 47.10 % Cu 53.03 % Cu₂O

Selenium 23.41 % Se 32.90 % SeO₂

Chlorine 10.51 % Cl 10.51 % Cl

- % Cl -2.37 % -O=Cl₂

Oxygen 18.97 % O

______ ______

100.00 % 94.07 % = TOTAL OXIDE

Empirical Formula:

Cu₅O₂(SeO₃)₂Cl₂

Environment:

A product of fumarolic activity (Temperature 200 deg. C.).

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

The cone of the South break of the Large Tolbachik fissure eruption (1975-1981), Kamchatka Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For Prof. Dr. Georgiy Borisovich Bokii (1909-) for his contributions to crystal chemistry and mineralogy.

Synonym:

ICSD 89637

IMA1996-015

PDF 51-1563

Georgbokiite Image

Images:

Georgbokiite

Comments: Deep reddish brown polished fragment of georgbokiite embedded in epoxy, co-type material.
Location: Tolbachik Volcano, Kamchatka Peninsula, Russia. Scale: Picture Size 300 µm.
© Rruff Database

Georgbokiite Crystallography

Axial Ratios:

a:b:c =0.4387:1:0.4049

Cell Dimensions:

a = 6.045, b = 13.778, c = 5.579, Z = 2; beta = 95.76° V = 462.32 Den(Calc)= 4.85

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 2.99(1), 2.296(0.95), 2.963(0.94),6.88(0.68), 2.566(0.67), 5.511(0.5),

Crystal Structure:

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Krivovichev S V , Shuvalov R R , Semenova T F , Filatov S K , Zeitschrift fur Kristallographie , 214 (1999) p.135-138, Crystal chemistry of inorganic compounds based on chains of oxocentered, tetrahedra. III. Crystal structure of georgbokiite, Cu5O2(SeO3)2Cl2, Locality: Tolbachik volcano, Kamchatka, Russia

Physical Properties of Georgbokiite

Cleavage:

{010} Perfect, {100} Very Good

Color:

Chestnut brown, Dark brown.

Diaphaneity:

Translucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

4 - Fluorite

Luster:

Vitreous - Adamantine

Streak:

yellowish brown

Optical Properties of Georgbokiite

Gladstone-Dale:

CI calc= -0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2282,KC= 0.2215
Ncalc = 2.07

Optical Data:

Biaxial (-), a=2.06, b=2.11, g=2.15, bire=0.0900

Calculated Properties of Georgbokiite

Electron Density:

Bulk Density (Electron Density)=4.47 gm/cc
note: Specific Gravity of Georgbokiite =4.85 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Georgbokiite= 40.09 barns/electron
U=PE_Georgbokiite x rElectron Density= 179.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Georgbokiite is Not Radioactive

Georgbokiite Classification

Dana Class:

34.06.07.02 (34)Selenites - Tellurites - Sulfites

(34.06)Dana Type

(34.06.07)Chloromenite Group

34.06.07.01 Chloromenite! Cu9O2(SeO3)4Cl6 I2/m 2/m

34.06.07.02 Georgbokiite! Cu5O2(SeO3)2Cl2 P 2₁/c 2/m

34.06.07.03 Parageorgbokiite! Cu5O2(SeO3)2Cl2 P 2₁/c 2/m

Strunz Class:

04.JG.05 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.05 Georgbokiite! Cu5O2(SeO3)2Cl2 P 2₁/c 2/m

04.JG.05 Parageorgbokiite! Cu5O2(SeO3)2Cl2 P 2₁/c 2/m

Other Georgbokiite Information

References:

NAME( MinRec V 31, No. 2) PHYS. PROP.(MinRec, V 31, No. 2) OPTIC PROP.(MinRec, V 31, No. 2)

See Also:

Links to other databases for Georgbokiite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - Handbook of Mineralogy (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info

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Georgbokiite

Cu5O2(SeO3)2Cl2
Dana No: 34.06.07.02 Strunz No: 04.JG.05
Locality:

Notes: