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Jarlite

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Ivigtut Cryolite deposit, Ivittuut (Ivigtut), Arsuk Firth, Arsuk, Kitaa (West Greenland) Province, Greenland
© L.C. 2011

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Formula:
Na(Sr,Na)
 
7
MgAl
 
6
F
 
32
(OH,H
 
2
O)
 
2
System:MonoclinicColour:Colourless, white, ...
Hardness:4 - 4½
Name:For Carl Frederik Jarl (1872-1951), an official of the Danish cryolite industry.


The Sr analogue of calcjarlite.

Compare also jørgensenite.

Classification of Jarlite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:3/B.03-50
Nickel-Strunz 10th (pending) edition ID:3.CC.20

3 : HALIDES
C : Complex halides
C : Soro-aluminofluorides
Dana 8th edition ID:11.6.10.1

11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
Hey's CIM Ref.:8.4.12

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 Jarlite

Type Locality:Ivigtut Cryolite deposit, Ivittuut (Ivigtut), Arsuk Firth, Arsuk, Kitaa (West Greenland) Province, Greenland
General Appearance of Type Material:Drusy crystals in cavities with thomsenolite in partially dissolved cryolite.
Year of Discovery:1933
Geological Setting of type material:Pegmatitic cryolite deposit in granite.
Associated Minerals at type locality:
TopazThomsenoliteFluoriteCryoliteChiolite

Physical Properties of Jarlite

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

Crystallography of Jarlite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 15.942Å, b = 10.821Å, c = 7.241Å
β = 101.86°
Ratio:a:b:c = 1.473 : 1 : 0.669
Unit Cell Volume: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.

Optical Data of Jarlite

Type:Biaxial (+/-)
RI values: nα = 1.429 nβ = 1.433 nγ = 1.436
2V:Measured: 90° , Calculated: 80°
Maximum Birefringence:δ = 0.007

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:none

Chemical Properties of Jarlite

Formula:
Na(Sr,Na)
 
7
MgAl
 
6
F
 
32
(OH,H
 
2
O)
 
2
Essential elements:Al, F, H, Mg, Na, O, Sr
All elements listed in formula:Al, F, H, Mg, Na, O, Sr
Common Impurities:Ca

Relationship of Jarlite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.CC.05Gearksutite
Ca[Al(F,OH)
 
5
(H
 
2
O)]
3.CC.10Acuminite
Sr[AlF
 
4
(OH)(H
 
2
O)]
3.CC.10Tikhonenkovite
Sr[AlF
 
4
(OH)(H
 
2
O)]
3.CC.15Artroeite
Pb[AlF
 
3
(OH)
 
2
]
3.CC.20Calcjarlite
Na(Ca,Sr)
 
3
Al
 
3
(OH)
 
2
F
 
14
3.CC.20Jørgensenite
Na
 
2
(Sr,Ba)
 
14
Na
 
2
Al
 
12
F
 
64
(OH,F)
 
4
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
Cl(OH)
 
3
 · 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
8.4.13Calcjarlite
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
8.4.18Bøgvadite
Na
 
2
SrBa
 
2
Al
 
4
F
 
20

Other Names for Jarlite

Other Languages:
German:Jarlit
Russian:Ярлит
Spanish:Jarlita
Varieties:
Meta-jarlite

Other Information

Other Information:Soluble in AlCl3 solution.
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 Jarlite

Reference List:

- +
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 Jarlite

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    • Localities for Jarlite

    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)
    		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 K Secher (1993) The Minerals of Greenland. Mineralogical Record 24:36
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