Bøgvadite
A valid IMA mineral species
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Richard Bøgvad
Formula:
Na2SrBa2Al4F20
Colour:
Colourless
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
3.85
Crystal System:
Monoclinic
Name:
Named in honor of Richard Bøgvad (21 November 1897, Frederiksberg, Denmark - 7 August 1952, Ivigtut, Greenland), formerly Chief Geologist for the company Oresund A/S, which mined the Ivigtut cryolite deposit.
This page provides mineralogical data about Bøgvadite.
Name Encoding
ASCII-7:
Bogvadite
Unique Identifiers
Mindat ID:
705
Long-form identifier:
mindat:1:1:705:4
IMA Classification of Bøgvadite
Approved
IMA Formula:
Na2Ba2SrAl4F20
Approval year:
1987
First published:
1988
Classification of Bøgvadite
3.CF.15
3 : HALIDES
C : Complex halides
F : Tekto-aluminofluorides
3 : HALIDES
C : Complex halides
F : Tekto-aluminofluorides
11.6.20.1
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
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
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Bgv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Bøgvadite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
4 on Mohs scale
Hardness:
VHN25=300 - 350 kg/mm2 - Vickers
Fracture:
Irregular/Uneven
Density:
3.85 g/cm3 (Measured) 3.898 g/cm3 (Calculated)
Optical Data of Bøgvadite
Type:
Biaxial (-)
RI values:
nα = 1.4326 nβ = 1.436 nγ = 1.4389
2V:
Measured: 87° , Calculated: 85°
Max. Birefringence:
δ = 0.006
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
Weak
Chemistry of Bøgvadite
Mindat Formula:
Na2SrBa2Al4F20
Element Weights:
Crystallography of Bøgvadite
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)°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.240 Å | (100) |
| 3.194 Å | (50) |
| 2.924 Å | (50) |
| 2.116 Å | (50) |
| 9.968 Å | (40) |
| 6.689 Å | (40) |
| 2.668 Å | (40) |
Reference:
Comments:
Recorded on type material
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| 25 : Evaporites (prebiotic) |
Type Occurrence of Bøgvadite
General Appearance of Type Material:
Blocky crystals to 0.15 mm, with rounded and corroded faces.
Place of Conservation of Type Material:
University of Copenhagen, Geological Museum, Copenhagen, Denmark, numbers 1989.172, 1989.173.
Geological Setting of Type Material:
Cryolite deposit
Associated Minerals at Type Locality:
Synonyms of Bøgvadite
Other Language Names for Bøgvadite
Related Minerals - Strunz-mindat Grouping
| 3.CF.05 | Hydrokenoralstonite | Na0.5(Al,Mg)2(F,OH)6 · H2O |
| 3.CF.10 | 'UM1941-01-F:AlCaHMgNa' | NaCaMgAl3F14 · 4H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Bøgvadite
mindat.org URL:
https://www.mindat.org/min-705.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Bøgvadite
Reference List:
Pauly, Hans; Petersen, Ole V. (1988) Bøgvadite, Na2SrBa2Al4F20, a new fluoride from the cryolite deposit, Ivigtut, S. Greenland. Bulletin of the Geological Society of Denmark, 37. 21-30 doi:10.37570/bgsd-1988-37-03
Localities for Bøgvadite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Greenland (TL) | |
| Pauly et al. (1988) +2 other references |
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