Lecoqite-(Y)
A valid IMA mineral species
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About Lecoqite-(Y)
Paul-Ămile Lecoq de Boisbaudran
Formula:
Na3Y(CO3)3 · 6H2O
Colour:
Colourless, white
Lustre:
Silky
Specific Gravity:
2.358 (Calculated)
Crystal System:
Hexagonal
Name:
Named for P.E. Lecoq de Boisbaudran (1838-1912), French chemist and specialist in the spectroscopic analysis of minerals and synthetic compounds. He discovered the chemical elements gallium, samarium, and dysprosium. The suffix/modifier follows the Levinson rule, indicating that the predominant essential REE is yttrium.
Known as a synthetic compound.
Unique Identifiers
Mindat ID:
39973
Long-form identifier:
mindat:1:1:39973:3
GUID
(UUID V4):
(UUID V4):
edde46ea-514a-4caa-86ff-7a91bd102411
IMA Classification of Lecoqite-(Y)
Classification of Lecoqite-(Y)
5.CC.45
5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)
5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Lec-Y | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Lecoqite-(Y)
Silky
Transparency:
Transparent
Colour:
Colourless, white
Streak:
White
Hardness Data:
Could not be measured
Tenacity:
Flexible
Cleavage:
None Observed
Parting:
Not observed
Fracture:
Splintery
Comment:
Flexible, but slightly elastic.
Density:
2.358 g/cm3 (Calculated)
Comment:
Could not be measured.
Optical Data of Lecoqite-(Y)
Type:
Uniaxial (+)
RI values:
nα =
Warning: number_format() expects parameter 1 to be float, string given in /home/mindat/www/show_class.php on line 4260
nω = 1.521(3) nε = 1.497 - 3.000
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nω = 1.521(3) nε = 1.497 - 3.000
Max Birefringence:
δ = 0.024
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:
Very High
Pleochroism:
Non-pleochroic
Chemistry of Lecoqite-(Y)
Mindat Formula:
Na3Y(CO3)3 · 6H2O
Crystallography of Lecoqite-(Y)
Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Setting:
P63
Cell Parameters:
a = 11.316(4) Å, c = 5.931(2) Å
Ratio:
a:c = 1 : 0.524
Unit Cell V:
657.7 Ă
Âł
Z:
2
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0020217 | Lecoqite-(Y) | Ben Ali A, Awaleh M O, Leblanc M, Smiri L S, Maisonneuve V, Houlbert S (2004) Hydrothermal sythesis, crystal structure, thermal behaviour, IR and Raman spectroscopy of Na3Y(CO3)3*6H2O _cod_database_code 9013471 Comptes Rendus Chimie 7 661-668 | 2004 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.82 Ă | (57) |
| 5.081 Ă | (100) |
| 3.779 Ă | (39) |
| 2.627 Ă | (39) |
| 2.471 Ă | (37) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-đ subsurface aqueous alteration (see also #23) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Lecoqite-(Y)
General Appearance of Type Material:
Radiating, spray-like aggregates in compact, tightly packed masses to 2.5 cm across, composed of flexible, extremely thin, capillary crystals up to 2.5 cm long and up to 0.01 mm thick.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia and the Canadian Museum of Nature, Ottawa, Canada.
Geological Setting of Type Material:
A late stage hydrothermal mineral in a hyperagpaitic pegmatite.
Associated Minerals at Type Locality:
Synonyms of Lecoqite-(Y)
Other Language Names for Lecoqite-(Y)
German:Lecoqit-(Y)
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 5.CC. | Alicewilsonite-(YCe) | Na2Sr2YCe(CO3)6 · 3H2O |
| 5.CC. | Alicewilsonite-(YLa) | Na2Sr2YLa(CO3)6 · 3H2O |
| 5.CC. | Yuchuanite-(Y) | Y2(CO3)3 · H2O |
| 5.CC. | Bainbridgeite-(NdCe) | Na2Ba2NdCe(CO3)6 · 3H2O |
| 5.CC.05 | Donnayite-(Y) | NaCaSr3Y(CO3)6 · 3H2O |
| 5.CC.05 | Ewaldite | Ba(Na,Ca,Y,Ce,K)(CO3)2 · 2.6H2O |
| 5.CC.05 | Mckelveyite-(Nd) | NaCaBa3Nd(CO3)6 · 3H2O |
| 5.CC.05 | Mckelveyite-(Y) | NaCaBa3Y(CO3)6 · 3H2O |
| 5.CC.05 | Weloganite | Na2Sr3Zr(CO3)6 · 3H2O |
| 5.CC.05 | Unnamed (MSH UK-37A) | Sr3NaCaY(CO3)6 · 3H2O |
| 5.CC.05 | UM1992-05-CO:CaCeLaNaSr | (Sr,Na,Y,REE,Ca,Ba)2(CO3)2 · H2O |
| 5.CC.05 | Bainbridgeite-(YCe) | Na2Ba2YCe(CO3)6 · 3H2O |
| 5.CC.10 | Tengerite-(Y) | Y2(CO3)3 · 2-3H2O |
| 5.CC.15 | Kimuraite-(Y) | Ca(Y,Nd)2(CO3)4 · 6H2O |
| 5.CC.15 | Lokkaite-(Y) | Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2O |
| 5.CC.15 | Hizenite-(Y) | Ca2Y6(CO3)11 · 14H2O |
| 5.CC.20 | Shomiokite-(Y) | Na3Y[CO3]3 · 3H2O |
| 5.CC.25 | Calkinsite-(Ce) | (Ce,La)2(CO3)3 · 4H2O |
| 5.CC.25 | Lanthanite-(Ce) | (Ce,La,Nd)2(CO3)3 · 8H2O |
| 5.CC.25 | Lanthanite-(La) | (La,Ce)2(CO3)3 · 8H2O |
| 5.CC.25 | Lanthanite-(Nd) | (Nd,La)2(CO3)3 · 8H2O |
| 5.CC.30 | Adamsite-(Y) | NaY[CO3]2 · 6H2O |
| 5.CC.35 | Decrespignyite-(Y) | Cu(Y,REE)4(CO3)4(OH)5Cl · 2H2O |
| 5.CC.40 | Galgenbergite-(Ce) | Ca(Ce,La,Nd)2(CO3)4 · H2O |
Fluorescence of Lecoqite-(Y)
Not fluorescent.
Other Information
IR Spectrum:
The IR spectrum of lecoqite-(Y) is considered as an important diagnostic property.
Notes:
Dissolves readily in both concentrated and dilute HCl at room temperature, with strong effervescence.
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 Lecoqite-(Y)
mindat.org URL:
https://www.mindat.org/min-39973.html
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References for Lecoqite-(Y)
Reference List:
Localities for Lecoqite-(Y)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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 (TL) | |
| Pekov et al. (2010) |
Spain | |
| Desor (2018) |
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Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada