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Jarlite

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Formula:
Na(Sr,Na)7MgAl6F32(OH,H2O)2
Colour:
Colourless, white, greyish; colourless in transmitted light.
Lustre:
Vitreous
Hardness:
4 - 4½
Specific Gravity:
3.78 - 3.93
Crystal System:
Monoclinic
Name:
For Carl Frederik Jarl (1872-1951), an official of the Danish cryolite industry.
The Sr analogue of calcjarlite.

Compare also jørgensenite.


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Classification of JarliteHide

Approved, 'Grandfathered' (first described prior to 1959)
3.CC.20

3 : HALIDES
C : Complex halides
C : Soro-aluminofluorides
11.6.10.1

11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.4.12

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

Physical Properties of JarliteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless, white, greyish; colourless in transmitted light.
Streak:
White
Hardness:
4 - 4½ on Mohs scale
Density:
3.78 - 3.93 g/cm3 (Measured)    

Optical Data of JarliteHide

Type:
Biaxial (+/-)
RI values:
nα = 1.429 nβ = 1.433 nγ = 1.436
2V:
Measured: 90° , Calculated: 80°
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of JarliteHide

Formula:
Na(Sr,Na)7MgAl6F32(OH,H2O)2
IMA Formula:
Na2(Sr,Na)14(Mg,◻)2Al12F64(OH)4
Common Impurities:
Ca

Crystallography of JarliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 15.942 Å, b = 10.821 Å, c = 7.241 Å
β = 101.86°
Ratio:
a:b:c = 1.473 : 1 : 0.669
Unit Cell V:
1,222.47 ų (Calculated from Unit Cell)
Morphology:
Crystals minute and tabular {100} and elongated [010]. Commonly grouped in fan-like or spherulitic aggregates. Massive; radial columnar structure at times.
Comment:
SG C2/m.

Type Occurrence of JarliteHide

General Appearance of Type Material:
Drusy crystals in cavities with thomsenolite in partially dissolved cryolite.
Geological Setting of Type Material:
Pegmatitic cryolite deposit in granite.
Associated Minerals at Type Locality:

Other Language Names for JarliteHide

German:Jarlit
Russian:Ярлит
Spanish:Jarlita

Varieties of JarliteHide

Meta-jarliteA variety of Jarlite containing some Mg, Ca, and Ba in substitution for Sr.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Pyrite4 photos of Jarlite associated with Pyrite on mindat.org.
Baryte3 photos of Jarlite associated with Baryte on mindat.org.
Fluorite3 photos of Jarlite associated with Fluorite on mindat.org.
Topaz2 photos of Jarlite associated with Topaz on mindat.org.
Cryolite2 photos of Jarlite associated with Cryolite on mindat.org.
Chiolite2 photos of Jarlite associated with Chiolite on mindat.org.
Thomsenolite2 photos of Jarlite associated with Thomsenolite on mindat.org.

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.20JørgenseniteNa2(Sr,Ba)14Na2Al12F64(OH,F)4Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

11.6.10.2CalcjarliteNa(Ca,Sr)3Al3(OH)2F14Mon.

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.
8.4.13CalcjarliteNa(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.
8.4.18BøgvaditeNa2SrBa2Al4F20Mon. 2/m

Other InformationHide

Notes:
Soluble in AlCl3 solution.
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 JarliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bøgvad (1933) Meddelelser om Grønland: 92(8), 11pp.
Brosset (1942) Doctoral dissertation, Stockholm.
Ferguson (1949) American Mineralogist: 34: 383.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 118-119.
Hawthorne, F. C. (1983): The crystal structure of jarlite. Canadian Mineralogist 21, 553-560.
Pauly, H & R.N.Nielsen (1992): Jarlite: order-disorder structure suggested by optics, results of new analyses and empirical formulae, Canadian Mineralogist (1992): 30: 449-455.

Internet Links for JarliteHide

Localities for JarliteHide

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.
Argentina
 
  • San Juan
    • Iglesia Department
Bengochea, L., Lara, R. y Mas, G., 1996. Kalinita y boyleita. Sulfatos secundarios del Área Valle del Cura; San Juan. 3ra Reunión de Mineralogía y Metalogenia. Instituto de Recursos Minerales, UNLP. Publicación 5: 63-66.
Greenland (TL)
 
  • Sermersooq
    • Arsuk Fjord
      • Ivittuut (Ivigtut)
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 112, 119; Canadian Mineralogist (1983): 21: 553; Canadian Mineralogist (1992): 30: 449.; Petersen, O.V. and Secher, K. (1993): The minerals of Greenland. Mineralogical Record 24 (2): 1-65 (p.36)
Mineral and/or Locality  
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