Georgbokiite Mineral Data

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

Search for Georgbokiite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Georgbokiite :

A Bijoux Google Search for Georgbokiite
Adam's Minerals Google Search for Georgbokiite
Cape Minerals Google Search for Georgbokiite
Dakota Matrix Minerals Google Search for Georgbokiite
Excalibur Mineral Corp. Google Search for Georgbokiite
Exceptional Minerals Google Search for Georgbokiite
John Betts Fine Minerals Search for Georgbokiite
McDougall Minerals Google Search for Georgbokiite
Mineral News Website Link
Rock and Mineral Shows Google Search for Georgbokiite
Weinrich Minerals, Inc. Google Search for Georgbokiite

Ask about Georgbokiite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Georgbokiite Specimen Label here :

Georgbokiite

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

Notes: