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Arisite-(La)

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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.
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-.


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Classification of Arisite-(La)Hide

Approved
Approval Year:
2009
5.BD.18

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

Physical Properties of Arisite-(La)Hide

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)
Fracture:
Conchoidal
Density:
4.072 g/cm3 (Calculated)
Comment:
sinks in methylene iodide

Optical Data of Arisite-(La)Hide

Type:
Uniaxial (-)
RI values:
nω = 1.696 - 1.717 nε = 1.594 - 1.611
Max Birefringence:
δ = 0.102 - 0.106
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
sharp

Chemical Properties of Arisite-(La)Hide

Formula:
NaLa2(CO3)2[F2x(CO3)1-x]F
IMA Formula:
NaLa2(CO3)2[(CO3)1-xF2x]F

Crystallography of Arisite-(La)Hide

Crystal System:
Hexagonal
Class (H-M):
6 m2 - 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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.428 (100)
4.338 (41)
3.099 (78)
2.557 (41)
2.421 (21)
2.214 (31)
2.203 (26)
1.972 (44)

Type Occurrence of Arisite-(La)Hide

General Appearance of Type Material:
chemical zones mixed with arisite-(Ce)

Synonyms of Arisite-(La)Hide

Other Language Names for Arisite-(La)Hide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Tuperssuatsiaite1 photo of Arisite-(La) associated with Tuperssuatsiaite on mindat.org.
Aegirine1 photo of Arisite-(La) associated with Aegirine on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.BD.05Cordylite-(Ce)NaBaCe2(CO3)4F Hex.
5.BD.05Lukechangite-(Ce)Na3Ce2(CO3)4FHex. 6mm : P63mc
5.BD.10Zhonghuacerite-(Ce)Ba2Ce(CO3)3FTrig.
5.BD.10Kukharenkoite-(Ce)Ba2Ce(CO3)3FMon. 2/m : P21/m
5.BD.10Kukharenkoite-(La)Ba2(La,Ce,Th)(CO3)3FMon. 2/m : P21/m
5.BD.15Cebaite-(Ce)Ba3Ce2(CO3)5F2
5.BD.15Cebaite-(Nd)Ba3(Nd,Ce)2(CO3)5F2Mon.
5.BD.18Arisite-(Ce)NaCe2(CO3)2[F2x(CO3)1-x]FHex. 6 m2 : P6m2
5.BD.20aBastnäsite-(Ce)Ce(CO3)FHex. 6 m2 : P6c2
5.BD.20aBastnäsite-(La)La(CO3)FHex.
5.BD.20aBastnäsite-(Y)Y(CO3)FHex. 6 m2 : P62c
5.BD.20aHydroxylbastnäsite-(Ce)Ce(CO3)(OH)Hex. 6 : P6
5.BD.20aHydroxylbastnäsite-(Nd)Nd(CO3)(OH)Hex.
5.BD.20aHydroxylbastnäsite-(La)(La,Nd,Ce)(CO3)(OH,F)Hex.
5.BD.20bParisite-(Ce)CaCe2(CO3)3F2Mon. m : Bb
5.BD.20bParisite-(Nd)Ca(Nd,Ce,La)2(CO3)3F2
5.BD.20dRöntgenite-(Ce)Ca2(Ce,La)3(CO3)5F3Trig. 3 : R3
5.BD.20cSynchysite-(Ce)CaCe(CO3)2FMon. 2/m : B2/b
5.BD.20cSynchysite-(Nd)CaNd(CO3)2F
5.BD.20cSynchysite-(Y)CaY(CO3)2FMon. 2/m : B2/b
5.BD.20aThorbastnäsiteThCa(CO3)2F2 · 3H2O
5.BD.20aBastnäsite-(Nd)Nd(CO3)F Hex. 6 m2 : P62c
5.BD.25Horváthite-(Y)NaY(CO3)F2Orth. mmm (2/m 2/m 2/m) : Pmmn
5.BD.25Qaqarssukite-(Ce)Ba(Ce,REE)(CO3)2FTrig. 3 : P3
5.BD.35Huanghoite-(Ce)BaCe(CO3)2FTrig. 3m (3 2/m) : R3m

Related Minerals - Dana Grouping (8th Ed.)Hide

16a.5.7.1Arisite-(Ce)NaCe2(CO3)2[F2x(CO3)1-x]FHex. 6 m2 : P6m2

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Arisite-(La)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
P. C. Piilonen, A. M. McDonald, J. D. Grice, M. A. Cooper, U. Kolitsch, R. Rowe, R. A. Gault and G. Poirier (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, 257-268.
Jahn, S. (2010): Arisit-(La)- ein neues Mineral von Aris bei Windhoek, Namibia. Mineralien-Welt, 21 (4): 34-35 (in German).

Internet Links for Arisite-(La)Hide

Localities for Arisite-(La)Hide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Namibia (TL)
 
  • Khomas Region
    • Windhoek District
      • Aris
P. C. Piilonen, A. M. McDonald, J. D. Grice, M. A. Cooper, U. Kolitsch, R. Rowe, R. A. Gault and G. Poirier (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, 257-268.; Blaß, G., Kolitsch, U., Tremmel, G., Esche, J. (2016): Neue Mineralienfunde aus den Phonolithbrüchen von Aris in Namibia. Mineralien-Welt 27 (4), 48-60 (in German); Kolitsch, U., Blaß, G., Jahn, S., Cámara, F., von Bezing, L., Wartha, R. R., Tremmel, G., Sturla, M., Cerea, P., Skebo, M. and Ciriotti, M. E. (2016): Aris - mineralogy of the famous alkaline phonolite. AMI - Associazione Micromineralogica Italiana, Cremona, Italy, 95 pp.
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