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Jørgensenite

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About JørgenseniteHide

04822820015611431599887.jpg
Vilhelm C. Jørgensen
Formula:
Na2(Sr,Ba)14Na2Al12F64(OH,F)4
Colour:
Colourless
Lustre:
Vitreous
Hardness:
3½ - 4
Specific Gravity:
3.89
Crystal System:
Monoclinic
Name:
Named in honor of Vilhelm Carl Jørgensen (2 May 1844, Tiselholt, Vejstrup Sogn, Denmark - 13 September 1925, Løndal near Silkeborg, Denmark), cofounder (with G.A. Hagemann) of the cryolite factory at Ivigtut in 1870.
Compare jarlite.


Classification of JørgenseniteHide

Approved
Approval Year:
1995
First Published:
1997
3.CC.20

3 : HALIDES
C : Complex halides
C : Soro-aluminofluorides

Physical Properties of JørgenseniteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
3½ - 4 on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
3.89(1) g/cm3 (Measured)    3.94 g/cm3 (Calculated)

Optical Data of JørgenseniteHide

Type:
Biaxial (-)
RI values:
nα = 1.436 nβ = 1.442 nγ = 1.442
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:
dispersion not observed
Pleochroism:
Non-pleochroic

Chemical Properties of JørgenseniteHide

Formula:
Na2(Sr,Ba)14Na2Al12F64(OH,F)4
IMA Formula:
Na2Sr14Na2Al12F64(OH)4

Crystallography of JørgenseniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 16.059(7) Å, b = 10.974(4) Å, c = 7.277(3) Å
β = 101.70(3)°
Ratio:
a:b:c = 1.463 : 1 : 0.663
Unit Cell V:
1,255.79 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Prisms elongated along [010].
Twinning:
None observed
Comment:
SG C2/m.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.844 Å(8)
3.643 Å(9)
3.453 Å(10)
3.193 Å(10)
3.112 Å(9)
2.989 Å(9)
2.173 Å(9)

Type Occurrence of JørgenseniteHide

General Appearance of Type Material:
Fissure fillings within the main cryolite mass, and in crystal-lined cavities containing fan-shaped aggregates (up to 2 mm across) of jorgensenite overgrown by jarlite.
Place of Conservation of Type Material:
The Geological Museum, University of Copenhagen,Copenhagen, fluorDenmark, catalogue number 1996.168.
Reference:
Pauly, H., F.C. Hawthorne, P.C. Burns, and G.D. Ventura (1997) Jørgensenite, Na2(Sr, Ba)14Na2Al12F64(OH, F)4, a new aluminofluoride mineral from Ivigtut, Greenland. Canadian Mineralogist: 35: 175–179.

Synonyms of JørgenseniteHide

Other Language Names for JørgenseniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Jørgensenite associated with WeberiteNa2Mg[AlF6]F
5 photos of Jørgensenite associated with BaryteBaSO4
2 photos of Jørgensenite associated with MuscoviteKAl2(AlSi3O10)(OH)2
2 photos of Jørgensenite associated with ThomsenoliteNaCa[AlF6] · H2O
2 photos of Jørgensenite associated with FluoriteCaF2
2 photos of Jørgensenite associated with SericiteKAl2(AlSi3O10)(OH)2

Related Minerals - Nickel-Strunz GroupingHide

3.CC.05GearksutiteCa[Al(F,OH)5(H2O)]Tric. 1 : P1
3.CC.10AcuminiteSr[AlF4(OH)(H2O)]Mon. 2/m : B2/b
3.CC.10TikhonenkoviteSr[AlF4(OH)(H2O)]Mon. 2/m : P21/b
3.CC.15ArtroeitePb[AlF3(OH)2]Tric. 1 : P1
3.CC.20CalcjarliteNa(Ca,Sr)3Al3(OH)2F14Mon.
3.CC.20JarliteNa(Sr,Na)7MgAl6F32(OH,H2O)2Mon. 2/m

Fluorescence of JørgenseniteHide

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 JørgenseniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pauly, H., F.C. Hawthorne, P.C. Burns, and G.D. Ventura (1997) Jørgensenite, Na2(Sr, Ba)14Na2Al12F64(OH, F)4, a new aluminofluoride mineral from Ivigtut, Greenland. Canadian Mineralogist: 35: 175–179.
Hawthorne, F.C. and Burns, P.C. (1997) The crystal structure of jørgensenite. Canadian Mineralogist: 35: 1509-1513.
Jambor, J.L., Roberts, A.C. (1997) New mineral names. American Mineralogist: 82: 1261-1264.
Mineralogical Record: 28: 485.

Internet Links for JørgenseniteHide

Localities for JørgenseniteHide

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.
Denmark (TL)
 
  • Greenland
    • Sermersooq
      • Arsuk Fjord
        • Ivittuut (Ivigtut)
Can. Mineral., 35, 175–179
 
Mineral and/or Locality  
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