Bogvadite Mineral Data

General Bogvadite Information

Chemical Formula:

Na2SrBa2Al4F20

Composition:

Molecular Weight = 896.15 gm

Barium 30.65 % Ba 34.22 % BaO

Sodium 5.13 % Na 6.92 % Na₂O

Strontium 9.78 % Sr 11.56 % SrO

Aluminum 12.04 % Al 22.76 % Al₂O₃

Fluorine 42.40 % F 42.40 % F

- % F -17.85 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂SrBa₂Al₄F₂₀

IMA Status:

Approved IMA 1988

Locality:

Ivigtut, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for Richard Bogvad (1952-), Danish, former chief geologist of the cryolite mining company.

Name Pronunciation:

Bogvadite + Pronunciation

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Bogvadite Crystallography

Axial Ratios:

a:b:c =0.3571:1:0.2685

Cell Dimensions:

a = 7.11, b = 19.907, c = 5.347, Z = 2; V = 756.81 Den(Calc)= 3.93

Crystal System:

OrthorhombicSpace Group: Pnmn,Pn2n

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

By Intensity(I/I_o): 3.2403(1), 2.9241(0.5), 3.1945(0.5),

Physical Properties of Bogvadite

Color:

Colorless.

Density:

3.85

Diaphaneity:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Bogvadite

Optical Data:

Biaxial (-), a=1.433, b=1.436, g=1.4389, bire=0.0059, 2V(Calc)=88, 2V(Meas)=87.

Calculated Properties of Bogvadite

Electron Density:

Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Bogvadite =3.93 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Bogvadite= 148.38 barns/electron
U=PE_Bogvadite x rElectron Density= 525.76 barns/cc.

Radioactivity:

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

Bogvadite Classification

Dana Class:

11.06.20.01 (11)Halide Complexes; Alumino-fluorides

(11.06)with miscellaneous formulae

(11.06.20)Dana Group

11.06.20.01 Bogvadite Na2SrBa2Al4F20 Pnmn,Pn2n Ortho

Strunz Class:

03.CF.15 03 - HALIDES

03.C - Complex Halides

03.CF -Tekto-aluminofluorides

03.CF.15 Bogvadite Na2SrBa2Al4F20 Pnmn,Pn2n Ortho

Other Bogvadite Information

References:

NAME( Dana8) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)

See Also:

Links to other databases for Bogvadite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Bogvadite

Na2SrBa2Al4F20
Dana No: 11.06.20.01 Strunz No: 03.CF.15
Locality:

Notes: