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Bøgvadite

Formula:
Na
 
2
SrBa
 
2
[Al
 
4
F
 
20
]
System:OrthorhombicColour:Colourless
Hardness:4
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.

Classification of Bøgvadite

IMA status:Approved 1987
Strunz 8th edition ID:3/B.03-45
Nickel-Strunz 10th (pending) edition ID:3.CF.15

3 : HALIDES
C : Complex halides
F : Tekto-aluminofluorides
Dana 8th edition ID:11.6.20.1

11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
Hey's CIM Ref.:8.4.18

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

Type Locality:Cryolite deposit, Ivittuut (Ivigtut), Arsuk Firth, Arsuk, Kitaa (West Greenland) Province, Greenland
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:
RalstoniteQuartzMica GroupKaoliniteJarlite
Baryte

Physical Properties of Bøgvadite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless
Streak:White
Hardness (Mohs):4
Hardness (Vickers):VHN25=300 - 350 kg/mm2
Fracture:Irregular/Uneven
Density (measured):3.85 g/cm3
Density (calculated):3.898 g/cm3

Crystallography of Bøgvadite

Crystal System:Orthorhombic
Cell Parameters:a = 7.11Å, b = 19.907Å, c = 5.347Å
Ratio:a:b:c = 0.357 : 1 : 0.269
Unit Cell Volume:V 756.81 ų (Calculated from Unit Cell)
Z:2
Morphology:Blocky crystals, showing {110}, {010} and {012}, slightly flattened on {010} and elongated parallel to [100], with rounded and corroded faces.
X-Ray Powder Diffraction:
d-spacingIntensity
3.240 (100)
3.194 (50)
2.924 (50)
2.116 (50)
9.968 (40)
6.689 (40)
Comments:Recorded on type material

Optical Data of Bøgvadite

Type:Biaxial (-)
RI values: nα = 1.433 nβ = 1.436 nγ = 1.439
2V:Measured: 87° , Calculated: 85°
Maximum Birefringence:δ = 0.006

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:Weak

Chemical Properties of Bøgvadite

Formula:
Na
 
2
SrBa
 
2
[Al
 
4
F
 
20
]
Essential elements:Al, Ba, F, Na, Sr
All elements listed in formula:Al, Ba, F, Na, Sr
Analyical Data:Averages of eleven electron microprobe analyses of type material; Fluorine content calculated from stoichiometry, giving values ranging from 40-45 wt.-%
Na    (5.57)
Ba   (32.17)
Sr    (7.03)
Al   (12.45)
F    (42.85)

sum  100.07 wt.-%
Empirical Formula:
Na
 
2.15
Sr
 
0.71
Ba
 
2.08
Al
 
4.09
F
 
20

Relationship of Bøgvadite to other Species

Related Minerals - Nickel-Strunz Grouping):
3.CF.05Ralstonite
NaMgAl(F,OH)
 
6
·H
 
2
O
3.CF.10Boldyrevite
NaCaMgAl
 
3
F
 
14
·4H
 
2
O
Related Minerals - Hey's Index Grouping:
8.4.1Sellaite
MgF
 
2
8.4.2Neighborite
NaMgF
 
3
8.4.3Bischofite
MgCl
 
2
 · 6H
 
2
O
8.4.4Korshunovskite
Mg
 
2
[(OH)
 
3
|Cl] · 4H
 
2
O
8.4.5Carnallite
KMgCl
 
3
·6H
 
2
O
8.4.6Tachyhydrite
CaMg
 
2
Cl
 
6
·12H
 
2
O
8.4.7Fluorite
CaF
 
2
8.4.8Sinjarite
CaCl
 
2
·2H
 
2
O
8.4.9Antarcticite
CaCl
 
2
 · 6H
 
2
O
8.4.10Chlorocalcite
KCaCl
 
3
8.4.11Rorisite
CaFCl
8.4.12Jarlite
Na(Sr,Ca)
 
3
Al
 
3
F
 
16
8.4.13Calcjarlite
Na(Ca,Sr)
 
3
Al
 
3
(OH)
 
2
F
 
14
8.4.14Tikhonenkovite
Sr[AlF
 
4
(OH)(H
 
2
O)]
8.4.15Acuminite
Sr[AlF
 
4
(OH)(H
 
2
O)]
8.4.16Frankdicksonite
BaF
 
2
8.4.17Usovite
Ba
 
2
CaMgAl
 
2
F
 
14

Other Names for Bøgvadite

Synonyms:
BogvaditeIMA1987-029
German names:
Bøgvadit
Spanish names:
Bøgvadita

Other Information

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

References for Bøgvadite

Reference List: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.

Internet Links for Bøgvadite

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    Localities for Bøgvadite

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    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Greenland
     
    • Kitaa (West Greenland) Province
      • Arsuk
        • Arsuk Firth
          • Ivittuut (Ivigtut)
    		[Bull.geol.Soc.Denmark,(1988) 37, 21-30; Clark, 1993 - "Hey's Mineral Index", p82]
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