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UM1992-05-CO:CaCeLaNaSr
Valid as an unnamed mineral
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Formula:
(Sr,Na,Y,REE,Ca,Ba)2(CO3)2 ยท H2O
Specific Gravity:
3.44 (Calculated)
Crystal System:
Trigonal
Polymorph of:
Although suggested to be a trigonal dimorph of donnayite-(Y), the chemistry differs.
Forms some transparent portions of up-to-3-mm crystals of triclinic donnayite-(Y); intergrown along (0001) with a porcellaneous grayish phase.
In the structure there is a disordered distribution of Na & REE, as opposed to the triclinic polymorph.
Forms some transparent portions of up-to-3-mm crystals of triclinic donnayite-(Y); intergrown along (0001) with a porcellaneous grayish phase.
In the structure there is a disordered distribution of Na & REE, as opposed to the triclinic polymorph.
Unique Identifiers
Mindat ID:
52130
Long-form identifier:
mindat:1:1:52130:5
IMA Classification of UM1992-05-CO:CaCeLaNaSr
IMA status notes:
Unnamed (probably valid)
Classification of UM1992-05-CO:CaCeLaNaSr
5.CC.05
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)
Physical Properties of UM1992-05-CO:CaCeLaNaSr
Density:
3.44(3) g/cm3 (Calculated)
Optical Data of UM1992-05-CO:CaCeLaNaSr
Type:
Uniaxial (-)
RI values:
nω = 1.65 nε = 1.565
Max. Birefringence:
δ = 0.085
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 ยตm 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 ยตm 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 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.
Chemistry of UM1992-05-CO:CaCeLaNaSr
Mindat Formula:
(Sr,Na,Y,REE,Ca,Ba)2(CO3)2 ยท H2O
Element Weights:
Crystallography of UM1992-05-CO:CaCeLaNaSr
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 5.211(1) Å, c = 18.357(7) Å
Ratio:
a:c = 1 : 3.523
Unit Cell V:
431.69 ร
ยณ (Calculated from Unit Cell)
Z:
3
Related Minerals - Strunz-mindat Grouping
| 5.CC. | Bainbridgeite-(NdCe) | Na2Ba2NdCe(CO3)6 ยท 3H2O |
| 5.CC. | Yuchuanite-(Y) | Y2(CO3)3 ยท H2O |
| 5.CC. | Alicewilsonite-(YCe) | Na2Sr2YCe(CO3)6 ยท 3H2O |
| 5.CC.05 | Donnayite-(Y) | NaCaSr3Y(CO3)6 ยท 3H2O |
| 5.CC.05 | Alicewilsonite-(YLa) | Na2Sr2YLa(CO3)6 ยท 3H2O |
| 5.CC.05 | Mckelveyite-(Nd) | NaCaBa3Nd(CO3)6 ยท 3H2O |
| 5.CC.05 | Mckelveyite-(Y) | NaCaBa3Y(CO3)6 ยท 3H2O |
| 5.CC.05 | Ewaldite | Ba(Na,Ca,Y,Ce,K)(CO3)2 ยท 2.6H2O |
| 5.CC.05 | Weloganite | Na2Sr3Zr(CO3)6 ยท 3H2O |
| 5.CC.05 | Mckelveyite Group | A3B3(CO3)6 ยท 3H2O |
| 5.CC.05 | Bainbridgeite-(YCe) | Na2Ba2YCe(CO3)6 ยท 3H2O |
| 5.CC.05 | 'Unnamed (MSH UK-37A)' | Sr3NaCaY(CO3)6 ยท 3H2O |
| 5.CC.10 | Tengerite-(Y) | Y2(CO3)3 ยท 2-3H2O |
| 5.CC.15 | Lokkaite-(Y) | Ca(Y,Gd,Nd,Dy)4(CO3)7 ยท 9H2O |
| 5.CC.15 | Kimuraite-(Y) | Ca(Y,Nd)2(CO3)4 ยท 6H2O |
| 5.CC.15 | Hizenite-(Y) | Ca2Y6(CO3)11 ยท 14H2O |
| 5.CC.20 | Shomiokite-(Y) | Na3Y[CO3]3 ยท 3H2O |
| 5.CC.25 | Lanthanite-(Ce) | Ce2(CO3)3 ยท 8H2O |
| 5.CC.25 | Lanthanite-(La) | La2(CO3)3 ยท 8H2O |
| 5.CC.25 | Lanthanite-(Nd) | Nd2(CO3)3 ยท 8H2O |
| 5.CC.25 | Calkinsite-(Ce) | (Ce,La)2(CO3)3 ยท 4H2O |
| 5.CC.30 | Adamsite-(Y) | NaY[CO3]2 ยท 6H2O |
| 5.CC.35 | Decrespignyite-(Y) | Cu(Y,REE)4(CO3)4(OH)5Cl ยท 2H2O |
| 5.CC.40 | Galgenbergite-(Ce) | Ca(Ce,La,Nd)2(CO3)4 ยท H2O |
| 5.CC.45 | Lecoqite-(Y) | Na3Y(CO3)3 ยท 6H2O |
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 UM1992-05-CO:CaCeLaNaSr
mindat.org URL:
https://www.mindat.org/min-52130.html
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References for UM1992-05-CO:CaCeLaNaSr
Reference List:
Localities for UM1992-05-CO:CaCeLaNaSr
Showing 1 localities.
โ - 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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
- 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.
Russia | |
| Ching Tji Le Tjy et al. (1992) +1 other reference |
