Jarlite
A valid IMA mineral species - grandfathered
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About Jarlite
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.
Unique Identifiers
Mindat ID:
2076
Long-form identifier:
mindat:1:1:2076:9
Similar Names
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 for Standard |
|---|---|---|
| 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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
High (negative)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
none
Chemistry of Jarlite
Mindat Formula:
Na(Sr,Na)7MgAl6F32(OH,H2O)2
Element Weights:
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
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
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2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
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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:
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
Associations Based on Photo Data:
| 11 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 Thomsenolite | NaCa[AlF6] · H2O |
| 2 photos of Jarlite associated with Topaz | Al2(SiO4)(F,OH)2 |
| 2 photos of Jarlite associated with Chiolite | Na5Al3F14 |
| 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
Please feel free to link to this page.
Please feel free to link to this page.
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References for Jarlite
Reference List:
Ferguson, R. B. (1949) Observations on some aluminium fluoride minerals. American Mineralogist, 34 (5-6) 383-397
Localities for Jarlite
Showing 3 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Bengochea +1 other reference |
Greenland (TL) | |
| [var: Meta-jarlite] Palache et al. (1951) +3 other references |
Quick NavTopAbout JarliteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesVarietiesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Ivigtut Mine, Ivigtut stock, Arsuk Fjord, Sermersooq, Greenland