Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

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
mindat.org URL:http://www.mindat.org/min-705.html
Please feel free to link to this page.

Type Occurrence of Bøgvadite

Type Locality:Ivigtut 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
Analytical 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.10UM1941-01-F:AlCaHMgNa
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,Na)
 
7
MgAl
 
6
F
 
32
(OH,H
 
2
O)
 
2
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
Other Languages:
German:Bøgvadit
Spanish: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

Search Engines:
  • Look for Bøgvadite on Google
  • Look for Bøgvadite images on Google
    • External Links:
  • Look for Bøgvadite on Webmineral
  • Look for Bøgvadite on Athena Mineralogy
  • Look for Bøgvadite on Wikipedia
  • Look for Bøgvadite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Bøgvadite in the Natural History Museum (London) online catalogue
  • Bøgvadite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Buy minerals from Mineralium.com
  • Buy fine minerals and gemstones from Pala International
  • Find Bøgvadite on www.crystalclassics.co.uk
  • Wilensky Fine Minerals
  • Top quality minerals from Kristalle of California
  • Buy RARE Minerals from Rocks of Africa
  • Buy from David K Joyce minerals
  • rare and unusual minerals mainly crystallized
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Search for - Bøgvadite - on e-Rocks Mineral Sales & Auctions
  • Buy Minerals and Crystals from Crystalarium.com
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    Localities for Bøgvadite

    Show Locality List (1 Items)
    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.
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 25th Nov 2009 03:59:23