Log In
Arisite-(La)
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Arisite-(La)
Formula:
NaLa2(CO3)2[F2x(CO3)1-x]F
Colour:
Beige, beige-yellow, light lemon-yellow, pinkish
Lustre:
Vitreous
Hardness:
3 - 3½
Specific Gravity:
4.072 (Calculated)
Crystal System:
Hexagonal
Name:
Named after the type locality at the Aris Quarries, Aris, Windhoek, Namibia. The "-(La)" suffix designates the dominant rare earth element in the composition.
Type Locality:
La-analogue of arisite-(Ce).
Chemically quite similar to cordylite-(La).
Structurally related to cebaite-(Ce), cordylite), huanghoite-(Ce), kukharenkoite, lukechangite-(Ce), and NaY2(CO3)3F phase. Layered structure with flat REE-fluorcarbonate group; layers of planar triangular carbonate groups are parallel to overall layering. There are 3 types of layers: REE(CO3)2F, Na(phi)9, and [2F/CO3]2-.
Chemically quite similar to cordylite-(La).
Structurally related to cebaite-(Ce), cordylite), huanghoite-(Ce), kukharenkoite, lukechangite-(Ce), and NaY2(CO3)3F phase. Layered structure with flat REE-fluorcarbonate group; layers of planar triangular carbonate groups are parallel to overall layering. There are 3 types of layers: REE(CO3)2F, Na(phi)9, and [2F/CO3]2-.
Unique Identifiers
Mindat ID:
39549
Long-form identifier:
mindat:1:1:39549:0
Similar Names
| Afrisite | A synonym of Schorl | |
| Aricite | A synonym of Gismondine-Ca | |
| Arisite | ||
| Arisite-(Ce) | A valid IMA mineral species | NaCe2(CO3)2[F2x(CO3)1-x]F |
| Arsoite | A rock subtype | |
| Asisite | A valid IMA mineral species | Pb7SiO9Cl2 |
| Irosita | A synonym of 'Iridosmine' | |
| Parisite | A group of related mineral species | Ca(Ce/La/Nd/REE)2(CO3)3F2 |
| Parisite-(Ce) | A valid IMA mineral species - grandfathered | CaCe2(CO3)3F2 |
| Parisite-(La) | A valid IMA mineral species | CaLa2(CO3)3F2 |
| Parisite-(Nd) | A valid IMA mineral species | Ca(Nd,Ce,La)2(CO3)3F2 |
| Urusite | A synonym of Sideronatrite |
IMA Classification of Arisite-(La)
Classification of Arisite-(La)
5.BD.18
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
D : With rare earth elements (REE)
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
D : With rare earth elements (REE)
16a.5.7.2
16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
5 : Miscellaneous
16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
5 : Miscellaneous
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 |
|---|---|---|
| Ari-La | 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 Arisite-(La)
Vitreous
Transparency:
Transparent
Colour:
Beige, beige-yellow, light lemon-yellow, pinkish
Hardness:
3 - 3½ on Mohs scale
Comment:
ca. 3 - 3.5
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Perpendicular to (001).
Perpendicular to (001).
Fracture:
Conchoidal
Density:
4.072 g/cm3 (Calculated)
Comment:
Sinks in methylene iodide.
Optical Data of Arisite-(La)
Type:
Uniaxial (-)
RI values:
nω = 1.696 - 1.717 nε = 1.594 - 1.611
Max. Birefringence:
δ = 0.102 - 0.106
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:
Very High (positive)
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 uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Optical Extinction:
sharp
Chemistry of Arisite-(La)
Mindat Formula:
NaLa2(CO3)2[F2x(CO3)1-x]F
Crystallography of Arisite-(La)
Crystal System:
Hexagonal
Class (H-M):
6m2 - Ditrigonal Dipyramidal
Space Group:
P6m2
Cell Parameters:
a = 5.113(7) Å, c = 8.6759(17) Å
Ratio:
a:c = 1 : 1.697
Unit Cell V:
196.42 ų (Calculated from Unit Cell)
Morphology:
Tabular prisms up to 1.5 mm.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.428 Å | (100) |
| 4.338 Å | (41) |
| 3.099 Å | (78) |
| 2.557 Å | (41) |
| 2.421 Å | (21) |
| 2.214 Å | (31) |
| 2.203 Å | (26) |
| 1.972 Å | (44) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 10 : Basalt-hosted zeolite minerals |
Type Occurrence of Arisite-(La)
General Appearance of Type Material:
Chemical zones mixed with arisite-(Ce), in tabular prisms up to 1.5 mm.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Ontario, Canada (CMNMC 86076).
Geological Setting of Type Material:
Miarolitic cavities within phonolite.
Associated Minerals at Type Locality:
Synonyms of Arisite-(La)
Other Language Names for Arisite-(La)
Common Associates
Associations Based on Photo Data:
| 1 photo of Arisite-(La) associated with Arisite-(Ce) | NaCe2(CO3)2[F2x(CO3)1-x]F |
| 1 photo of Arisite-(La) associated with Tuperssuatsiaite | Fe3+Fe3+2(Na◻)◻2Si8O20(OH)2(H2O)4 · 2H2O |
| 1 photo of Arisite-(La) associated with Aegirine | NaFe3+Si2O6 |
Related Minerals - Strunz-mindat Grouping
| 5.BD. | Cordylite-(La) | (Na,Ca)Ba(La,Ce,Sr)2(CO3)4F |
| 5.BD.05 | Cordylite-(Ce) | NaBaCe2(CO3)4F |
| 5.BD.05 | 'Unnamed (Cordylite-like Calcium-Barium-Cerium Carbonate-Fluoride)' | Ca◻Ba2Ce4[CO3]8F2 |
| 5.BD.05 | Lukechangite-(Ce) | Na3Ce2(CO3)4F |
| 5.BD.10 | 'Zhonghuacerite-(Ce)' | Ba2Ce(CO3)3F |
| 5.BD.10 | Kukharenkoite-(Ce) | Ba2Ce(CO3)3F |
| 5.BD.10 | Kukharenkoite-(La) | Ba2(La,Ce,Th)(CO3)3F |
| 5.BD.15 | Cebaite-(Ce) | Ba3Ce2(CO3)5F2 |
| 5.BD.15 | 'Cebaite-(Nd)' | Ba3(Nd,Ce)2(CO3)5F2 |
| 5.BD.18 | Arisite-(Ce) | NaCe2(CO3)2[F2x(CO3)1-x]F |
| 5.BD.20c | Synchysite-(Ce) | CaCe(CO3)2F |
| 5.BD.20c | Synchysite-(Nd) | CaNd(CO3)2F |
| 5.BD.20c | Synchysite-(Y) | CaY(CO3)2F |
| 5.BD.20a | Bastnäsite-(Ce) | Ce(CO3)F |
| 5.BD.20b | Parisite-(Ce) | CaCe2(CO3)3F2 |
| 5.BD.20a | Bastnäsite-(La) | La(CO3)F |
| 5.BD.20b | Parisite-(Nd) | Ca(Nd,Ce,La)2(CO3)3F2 |
| 5.BD.20a | Bastnäsite-(Y) | Y(CO3)F |
| 5.BD.20b | Parisite-(La) | CaLa2(CO3)3F2 |
| 5.BD.20d | Röntgenite-(Ce) | Ca2(Ce,La)3(CO3)5F3 |
| 5.BD.20a | Thorbastnäsite | ThCa(CO3)2F2 · 3H2O |
| 5.BD.20a | Hydroxylbastnäsite-(Ce) | Ce(CO3)(OH) |
| 5.BD.20a | Hydroxylbastnäsite-(Nd) | Nd(CO3)(OH) |
| 5.BD.20c | 'Hydroxylsynchysite-(Ce)' | Ca(Ce,La)(CO3)2(OH) |
| 5.BD.20c | 'Synchysite-(La)' | Ca(La,Nd)(CO3)2F |
| 5.BD.20a | Bastnäsite-(Nd) | Nd(CO3)F |
| 5.BD.20a | Hydroxylbastnäsite-(La) | (La,Nd,Ce)(CO3)(OH,F) |
| 5.BD.25 | Qaqarssukite-(Ce) | Ba(Ce,REE)(CO3)2F |
| 5.BD.25 | Horváthite-(Y) | NaY(CO3)F2 |
| 5.BD.35 | Huanghoite-(Ce) | BaCe(CO3)2F |
| 5.BD.35 | Huanghoite-(Nd) | BaNd(CO3)2F |
| 5.BD.45 | Bayanoboite-(Y) | Ba2Y(CO3)2F3 |
Other Information
Notes:
Slowly dissolves in dilute HCl.
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 Arisite-(La)
mindat.org URL:
https://www.mindat.org/min-39549.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Arisite-(La)
Reference List:
Piilonen, P. C., McDonald, A. M., Grice, J. D., Cooper, M. A., Kolitsch, U., Rowe, R., Gault, R. A., Poirier, G. (2010) Arisite-(La), a new REE-fluorcarbonate mineral from the Aris phonolite (Namibia), with descriptions of the crystal structures of arisite-(La) and arisite-(Ce) Mineralogical Magazine, 74 (2) 257-268 doi:10.1180/minmag.2010.074.2.257
Localities for Arisite-(La)
Showing 1 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.
Namibia (TL) | |
| Piilonen et al. (2010) +2 other references |
Quick NavTopAbout Arisite-(La)Unique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Aris Quarries, Aris, Windhoek Rural, Khomas Region, Namibia