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Bøgvadite

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Formula:
Na2SrBa2Al4F20
Colour:
Colourless
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
3.85
Crystal System:
Monoclinic
Name:
For Richard Bøgvad (1897-1952), formerly Chief Geologist for the company Oresund A/S, which mined the Ivigtut cryolite deposit.
This page provides mineralogical data about Bøgvadite.


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Classification of BøgvaditeHide

Approved
Approval Year:
1987
3.CF.15

3 : HALIDES
C : Complex halides
F : Tekto-aluminofluorides
11.6.20.1

11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.4.18

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg

Physical Properties of BøgvaditeHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
Hardness:
VHN25=300 - 350 kg/mm2 - Vickers
Fracture:
Irregular/Uneven
Density:
3.85 g/cm3 (Measured)    3.898 g/cm3 (Calculated)

Optical Data of BøgvaditeHide

Type:
Biaxial (-)
RI values:
nα = 1.433 nβ = 1.436 nγ = 1.439
2V:
Measured: 87° , Calculated: 85°
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Weak

Chemical Properties of BøgvaditeHide

Formula:
Na2SrBa2Al4F20
IMA Formula:
Na2Ba2SrAl4F20

Crystallography of BøgvaditeHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 7.134(1) Å, b = 19.996(3) Å, c = 5.3440(8) Å
β = 90.02(1)°
Ratio:
a:b:c = 0.357 : 1 : 0.267
Unit Cell V:
762.33 ų (Calculated from Unit Cell)
Morphology:
Blocky crystals, showing {110}, {010} and {012}, slightly flattened on {010} and elongated parallel to [100], with rounded and corroded faces.
Comment:
Space group P21/n. Pseudo-orthorhombic.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.240 (100)
3.194 (50)
2.924 (50)
2.116 (50)
9.968 (40)
6.689 (40)
2.668 (40)
Comments:
Recorded on type material

Type Occurrence of BøgvaditeHide

General Appearance of Type Material:
Blocky crystals to 0.15 mm, with rounded and corroded faces
Geological Setting of Type Material:
Cryolite deposit
Associated Minerals at Type Locality:

Synonyms of BøgvaditeHide

Other Language Names for BøgvaditeHide

German:Bøgvadit
Spanish:Bøgvadita

Related Minerals - Nickel-Strunz GroupingHide

3.CF.05Hydrokenoralstonite Na0.5(Al,Mg)2(F,OH)6•H2O Iso. m3m (4/m 3 2/m) : Fd3m
3.CF.10UM1941-01-F:AlCaHMgNaNaCaMgAl3F14 · 4H2O

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.4.1SellaiteMgF2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
8.4.2NeighboriteNaMgF3Orth. mmm (2/m 2/m 2/m)
8.4.3BischofiteMgCl2 · 6H2OMon. 2/m : B2/m
8.4.4KorshunovskiteMg2Cl(OH)3 · 4H2OTric.
8.4.5CarnalliteKMgCl3 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
8.4.6TachyhydriteCaMg2Cl6 · 12H2OTrig.
8.4.7FluoriteCaF2Iso. m3m (4/m 3 2/m) : Fm3m
8.4.8SinjariteCaCl2 · 2H2OTet.
8.4.9AntarcticiteCaCl2 · 6H2OTrig. 3 2 : P3 2 1
8.4.10ChlorocalciteKCaCl3Orth. mmm (2/m 2/m 2/m) : Pnma
8.4.11RorisiteCaFClTet.
8.4.12JarliteNa(Sr,Na)7MgAl6F32(OH,H2O)2Mon. 2/m
8.4.13CalcjarliteNa(Ca,Sr)3Al3(OH)2F14Mon.
8.4.14TikhonenkoviteSr[AlF4(OH)(H2O)]Mon. 2/m : P21/b
8.4.15AcuminiteSr[AlF4(OH)(H2O)]Mon. 2/m : B2/b
8.4.16FrankdicksoniteBaF2Iso. m3m (4/m 3 2/m) : Fm3m
8.4.17UsoviteBa2CaMgAl2F14Mon.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BøgvaditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pauly, H. and Petersen, O. V. (1988): Bøgvadite, Na2SrBa2Al4F20, a new fluoride from the cryolite deposit, Ivigtut, S. Greenland. Bull. Geol. Soc. Denmark 37, 21-30. - American Mineralogist (1991), 76, 1728-1729 (abstract).
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 69.
Balić-Žunić, T. (2014): The crystal structure of bøgvadite (Na2SrBa2Al4F20). Mineralogy and Petrology 108, 479-486.

Internet Links for BøgvaditeHide

Localities for BøgvaditeHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Greenland (TL)
 
  • Sermersooq
    • Arsuk Fjord
      • Ivittuut (Ivigtut)
[Bull.geol.Soc.Denmark,(1988) 37, 21-30; Clark, 1993 - "Hey's Mineral Index", p82]; Petersen, O. V and K Secher (1993) The Minerals of Greenland. Mineralogical Record 24:36
Mineral and/or Locality  
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