Jarlite
A valid IMA mineral species - grandfathered
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About Jarlite
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.
Unique Identifiers
Mindat ID:
2076
Long-form identifier:
mindat:1:1:2076:9
GUID
(UUID V4):
(UUID V4):
42c0e9bf-74a9-4c43-a6a3-d6ffb359286f
IMA Classification of Jarlite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Na2(Sr,Na)14(Mg,◻)2Al12F64(OH)4
First published:
1933
Type description reference:
Classification of Jarlite
3.CC.20
3 : HALIDES
C : Complex halides
C : Soro-aluminofluorides
3 : HALIDES
C : Complex halides
C : Soro-aluminofluorides
11.6.10.1
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
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
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Jar | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Jarlite
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 Jarlite
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none
Chemistry of Jarlite
Mindat Formula:
Na(Sr,Na)7MgAl6F32(OH,H2O)2
Common Impurities:
Ca
Crystallography of Jarlite
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°
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 Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005194 | Jarlite | Hawthorne F C (1983) The crystal structure of jarlite The Canadian Mineralogist 21 553-560 | 1983 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Jarlite
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.
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 Jarlite
Varieties of Jarlite
Meta-jarlite | A variety of Jarlite containing some Mg, Ca, and Ba in substitution for Sr. |
Common Associates
Associated Minerals Based on Photo Data:
10 photos of Jarlite associated with Baryte | BaSO4 |
4 photos of Jarlite associated with Pyrite | FeS2 |
4 photos of Jarlite associated with Cryolite | Na2NaAlF6 |
3 photos of Jarlite associated with Fluorite | CaF2 |
2 photos of Jarlite associated with Topaz | Al2(SiO4)(F,OH)2 |
2 photos of Jarlite associated with Chiolite | Na5Al3F14 |
2 photos of Jarlite associated with Thomsenolite | NaCa[AlF6] · H2O |
1 photo of Jarlite associated with Schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
Related Minerals - Strunz-mindat Grouping
3.CC.05 | Gearksutite | Ca[Al(F,OH)5(H2O)] |
3.CC.10 | Acuminite | Sr[AlF4(OH)(H2O)] |
3.CC.10 | Tikhonenkovite | Sr[AlF4(OH)(H2O)] |
3.CC.15 | Artroeite | Pb[AlF3(OH)2] |
3.CC.20 | Calcjarlite | Na(Ca,Sr)3Al3(OH)2F14 |
3.CC.20 | Jørgensenite | Na2(Sr,Ba)14Na2Al12F64(OH,F)4 |
Other Information
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 Jarlite
mindat.org URL:
https://www.mindat.org/min-2076.html
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Please feel free to link to this page.
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References for Jarlite
Reference List:
Localities for Jarlite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Argentina | |
| Bengochea +1 other reference |
Greenland (TL) | |
| Palache et al. (1951) +3 other references |
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Ivigtut Mine, Ivigtut stock, Arsuk Fjord, Sermersooq, Greenland