Britvinite Mineral Data

General Britvinite Information

Chemical Formula:

Pb7+xMg4.5[(Si,Al)5O14](BO3)(BO3,AsO4)(CO3)(OH,O)7 ( x < 0.5)

Composition:

Molecular Weight = 4,587.29 gm

Magnesium 4.78 % Mg 7.93 % MgO

Aluminum 0.22 % Al 0.41 % Al₂O₃

Silicon 5.96 % Si 12.74 % SiO₂

Boron 0.83 % B 2.66 % B₂O₃

Hydrogen 0.26 % H 2.30 % H₂O

Lead 66.62 % Pb 71.77 % PbO

Carbon 0.57 % C 2.09 % CO₂

Oxygen 20.76 % O

______ ______

100.00 % 99.91 % = TOTAL OXIDE

Empirical Formula:

Pb_14.75Mg_9.03Si_9.73Al_0.37O_30.76(BO₃)_3.51(CO₃)_2.18(OH)_11.7

Environment:

Layer silicate

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Lï¿½ngban deposit, Bergslagen ore region, Filipstad district, Vï¿½rmland, Sweden Link to MinDat.org Location Data.

Name Origin:

Named for Sergei Nikolaevich Britvin (b. 1965), a Russian mineralogist.

Synonym:

IMA2006-031

Britvinite Crystallography

Axial Ratios:

a:b:c =0.9979:1:2.0121

Cell Dimensions:

a = 9.3409, b = 9.3597, c = 18.8333, Z = 1; alpha = 80.365°, beta = 75.816°, gamma = 59.87° V = 1,361.20 Den(Calc)= 5.60

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 18.1(1), 3.02(0.9), 2.698(0.7),1.519(0.4), 1.766(0.4), 1.867(0.3), 2.275(0.3), 3.39(0.3),

Physical Properties of Britvinite

Cleavage:

{001} Perfect

Color:

Pale yellow, Colorless.

Diaphaneity:

Transparent

Fracture:

Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3 - Calcite

Luster:

Adamantine

Streak:

white

Optical Properties of Britvinite

Gladstone-Dale:

CI calc= -0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1632,KC= 0.1566
Ncalc = 1.86

Optical Data:

Biaxial (+/-), a=1.896, b=1.903, g=1.903, bire=0.0070, 2V(Calc)=0, 2V(Meas)=20. Dispersion strong, r < v.

Calculated Properties of Britvinite

Electron Density:

Bulk Density (Electron Density)=4.76 gm/cc
note: Specific Gravity of Britvinite =5.52 gm/cc.

Fermion Index:

Fermion Index = 0.15
Boson Index = 0.85

Photoelectric:

PE_Britvinite=1,186.68 barns/electron
U=PE_Britvinite x rElectron Density=5,647.46 barns/cc.

Radioactivity:

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

Britvinite Classification

Dana Class:

71.05.03.01 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.05)with other anions

(71.05.03)Dana Group

71.05.03.01 Britvinite! Pb7xMg4.5[(Si,Al)5O14](BO3)(BO3,AsO4)(CO3)(OH,O)7(x<0.5) P1 1

Strunz Class:

09.EG.70 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EG -Double nets with 6-membered and larger rings

09.EG.70 Britvinite! Pb7xMg4.5[(Si,Al)5O14](BO3)(BO3,AsO4)(CO3)(OH,O)7(x<0.5) P1 1

Other Britvinite Information

References:

NAME( Geology of Ore Deposits, v50:713) PHYS. PROP.(Geology of Ore Deposits, v50:713) OPTIC PROP.(Geology of Ore Deposits, v50:713)

See Also:

Links to other databases for Britvinite :
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 Britvinite Specimen Label here :

Britvinite

Pb7+xMg4.5[(Si,Al)5O14](BO3)(BO3,AsO4)(CO3)(OH,O)7 ( x < 0.5)
Dana No: 71.05.03.01 Strunz No: 09.EG.70
Locality:

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