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Jarlite

A valid IMA mineral species - grandfathered
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About JarliteHide

01691540017067019468528.jpg
Carl F. Jarl
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:
Named in honor of Carl Frederik Jarl (1 August 1872, Copenhagen, Denmark - 25 January 1951, Birkerød, Denmark), engineer and an official of the Danish cryolite industry.
The Sr analogue of calcjarlite.

Compare also jørgensenite.


Unique IdentifiersHide

Mindat ID:
2076
Long-form identifier:
mindat:1:1:2076:9
GUID
(UUID V4):
42c0e9bf-74a9-4c43-a6a3-d6ffb359286f

IMA Classification of JarliteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Na2(Sr,Na)14(Mg,◻)2Al12F64(OH)4
First published:
1933

Classification of JarliteHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
JarIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of JarliteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless, white, greyish; colourless in transmitted light.
Streak:
White
Hardness:
4 - 4½ on Mohs scale
Fracture:
Irregular/Uneven
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

Chemistry of JarliteHide

Mindat Formula:
Na(Sr,Na)7MgAl6F32(OH,H2O)2
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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005194JarliteHawthorne F C (1983) The crystal structure of jarlite The Canadian Mineralogist 21 553-56019830293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.97 Å(100)
3.18 Å(90)
2.15 Å(70)
3.10 Å(60)
1.812 Å(60)
3.62 Å(40)
3.44 Å(40)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)

Type Occurrence of JarliteHide

General Appearance of Type Material:
Drusy crystals in cavities with thomsenolite in partially dissolved cryolite.
Place of Conservation of Type Material:
Holotype probably lost.
1) University of Copenhagen, Copenhagen, Denmark.
2) The Natural History Museum, London, England.
Geological Setting of Type Material:
Pegmatitic cryolite deposit in granite.
Associated Minerals at Type Locality:
Reference:
Bøgvad, R. (1933) New minerals from Ivigtut, Southwest Greenland. Meddelelser om Grønland: 92(8): 2-11.

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:
10 photos of Jarlite associated with BaryteBaSO4
4 photos of Jarlite associated with PyriteFeS2
4 photos of Jarlite associated with CryoliteNa2NaAlF6
3 photos of Jarlite associated with FluoriteCaF2
2 photos of Jarlite associated with TopazAl2(SiO4)(F,OH)2
2 photos of Jarlite associated with ChioliteNa5Al3F14
2 photos of Jarlite associated with ThomsenoliteNaCa[AlF6] · H2O
1 photo of Jarlite associated with SchorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

Related Minerals - Strunz-mindat 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

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.

Internet Links for JarliteHide

References 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 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Argentina
 
  • San Juan Province
    • Iglesia Department
Bengochea +1 other reference
Greenland (TL)
 
  • Sermersooq
    • Arsuk Fjord
      • Ivigtut stock
Palache et al. (1951) +3 other references
 
Mineral and/or Locality  
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