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Rémondite-(La)
A valid IMA mineral species
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About Rémondite-(La)
Formula:
Na3(La,Ca,Na)3(CO3)5
Colour:
Bright yellow orange
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3.5
Crystal System:
Monoclinic
Member of:
Name:
For its relation to rémondite-(Ce), to honour Dr. Guy Rémond (1935 – 2 December 2014), physicist, Bureau de Recherches Géologiques et Minières, Orléans, France, for his work on the physics of minerals. The suffix/modifier indicates the predominance of lanthanum over other rare-earth elements in the composition.
Type Locality:
This page provides mineralogical data about Rémondite-(La).
Name Encoding
ASCII-7:
Remondite-(La)
Unique Identifiers
Mindat ID:
11012
Long-form identifier:
mindat:1:1:11012:7
Similar Names
| Raimondite | ||
| Redmondite | A valid IMA mineral species | [Pb8O2Zn(OH)6](S2O3)4 |
| Redondite | A valid IMA mineral species - grandfathered - questionable | AlPO4 · 2H2O |
| Rémondite | ||
| Rémondite-(Ce) | A valid IMA mineral species | Na3(Ce,Ca,Na)3(CO3)5 |
IMA Classification of Rémondite-(La)
Classification of Rémondite-(La)
5.AD.15
5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
D : With rare-earth elements (REE)
5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
D : With rare-earth elements (REE)
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 |
|---|---|---|
| Rém-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 Rémondite-(La)
Vitreous
Transparency:
Transparent
Colour:
Bright yellow orange
Streak:
White
Hardness:
3 on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
3.5 g/cm3 (Measured) 3.57 g/cm3 (Calculated)
Optical Data of Rémondite-(La)
Type:
Biaxial (-)
RI values:
nα = 1.615 nβ = 1.619 nγ = 1.622
2V:
Measured: 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 (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 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:
r < v
Pleochroism:
Non-pleochroic
Chemistry of Rémondite-(La)
Mindat Formula:
Na3(La,Ca,Na)3(CO3)5
Element Weights:
Crystallography of Rémondite-(La)
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Setting:
P21
Cell Parameters:
a = 10.49 Å, b = 6.417 Å, c = 10.5 Å
β = 119.8°
β = 119.8°
Ratio:
a:b:c = 1.635 : 1 : 1.636
Unit Cell V:
613 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.14 Å | (40) |
| 5.28 Å | (50) |
| 4.56 Å | (30) |
| 3.70 Å | (70) |
| 3.20 Å | (40) |
| 3.036 Å | (90) |
| 2.740 Å | (50) |
| 2.623 Å | (100) |
| 2.143 Å | (80) |
| 2.083 Å | (40) |
| 2.041 Å | (60) |
| 1.985 Å | (50) |
| 1.939 Å | (60) |
| 1.753 Å | (40) |
| 1.515 Å | (40) |
| 1.372 Å | (30) |
| 1.343 Å | (30) |
Comments:
Koashva Open Pit, Khibiny Massif, Russia. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Rémondite-(La)
General Appearance of Type Material:
Microporous aggregates up to 2 mm in size consisting of irregular grains to 5 µm.
Place of Conservation of Type Material:
A. E. Fersman Mienralogical Museum, Moscow, Russia, number 89694 (holotype).
Geological Setting of Type Material:
In a hyperagpaitic pegmatite.
Associated Minerals at Type Locality:
Synonyms of Rémondite-(La)
Other Language Names for Rémondite-(La)
Relationship of Rémondite-(La) to other Species
Member of:
Other Members of Burbankite Group:
| Burbankite | (Na,Ca)3(Sr,Ba,Ce)3(CO3)5 | Hex. 6mm : P63mc |
| Calcioburbankite | Na3(Ca,REE,Sr)3(CO3)5 | Hex. 6mm : P63mc |
| Khanneshite | (Na,Ca)3(Ba,Sr,Ce,Ca)3(CO3)5 | Hex. 6mm : P63mc |
| Lishiite | (Ca2◻)Sr3(CO3)5 | Hex. 6mm : P63mc |
| Petersenite-(Ce) | Na4(Ce,La,Nd)2(CO3)5 | Mon. 2 : P21 |
| Rémondite-(Ce) | Na3(Ce,Ca,Na)3(CO3)5 | Mon. 2 : P21 |
| Sanrománite | Na2CaPb3[CO3]5 | Hex. 6mm : P63mc |
Common Associates
Associations Based on Photo Data:
| 1 photo of Rémondite-(La) associated with Synchysite-(Ce) | CaCe(CO3)2F |
Related Minerals - Strunz-mindat Grouping
| 5.AD.05 | Sahamalite-(Ce) | (Mg,Fe)(Ce,La,Nd)2(CO3)4 |
| 5.AD.15 | Rémondite-(Ce) | Na3(Ce,Ca,Na)3(CO3)5 |
| 5.AD.15 | Petersenite-(Ce) | Na4(Ce,La,Nd)2(CO3)5 |
| 5.AD.20 | Paratooite-(La) | (La,Sr,Ca)4CuCa(Na,Ca)2(CO3)8 |
Other Information
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 Rémondite-(La)
mindat.org URL:
https://www.mindat.org/min-11012.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Rémondite-(La)
Reference List:
Localities for Rémondite-(La)
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.
Canada | |
| ZVMO 129 (1) |
Russia (TL) | |
| Pekov et al. (2000) |
| Pekov et al. (2004) |
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Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada