Laplandite-(Ce)
A valid IMA mineral species
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About Laplandite-(Ce)
Formula:
Na4CeTiPO4Si7O18 · 5H2O
Colour:
Gray-white, pale yellow, pale blue
Lustre:
Vitreous, Greasy
Hardness:
2 - 3
Specific Gravity:
2.83
Crystal System:
Orthorhombic
Name:
For Lappland (Lapland), the region in which the Kola Peninsula lies.
This page provides mineralogical data about Laplandite-(Ce).
Unique Identifiers
Mindat ID:
2331
Long-form identifier:
mindat:1:1:2331:9
IMA Classification of Laplandite-(Ce)
Approved
IMA Formula:
Na4Ce3+Ti4+PSi7O22·5H2O
Approval year:
1974
First published:
1974
Classification of Laplandite-(Ce)
9.DJ.10
9 : SILICATES (Germanates)
D : Inosilicates
J : Inosilicates with 4-periodic double and triple chains
9 : SILICATES (Germanates)
D : Inosilicates
J : Inosilicates with 4-periodic double and triple chains
78.7.9.1
78 : Unclassified Silicates
7 :
78 : Unclassified Silicates
7 :
17.6.10
17 : Silicates Containing other Anions
6 : Silicates with phosphate
17 : Silicates Containing other Anions
6 : Silicates with phosphate
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 |
|---|---|---|
| Lpl-Ce | 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 Laplandite-(Ce)
Vitreous, Greasy
Transparency:
Transparent, Translucent
Colour:
Gray-white, pale yellow, pale blue
Hardness:
2 - 3 on Mohs scale
Fracture:
Splintery
Density:
2.83 g/cm3 (Measured) 2.71 g/cm3 (Calculated)
Optical Data of Laplandite-(Ce)
Type:
Biaxial (-)
RI values:
nα = 1.568 nβ = 1.584 nγ = 1.585
2V:
Measured: 28° , Calculated: 26°
Max. Birefringence:
δ = 0.017
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:
Moderate (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 strong
Chemistry of Laplandite-(Ce)
Mindat Formula:
Na4CeTiPO4Si7O18 · 5H2O
Element Weights:
Crystallography of Laplandite-(Ce)
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pmmm
Setting:
Pmmm
Cell Parameters:
a = 7.27 Å, b = 14.38 Å, c = 22.25 Å
Ratio:
a:b:c = 0.506 : 1 : 1.547
Unit Cell V:
2,326.07 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Radial-fibrous aggregates.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.27 Å | (100) |
| 3.76 Å | (100) |
| 3.35 Å | (100) |
| 3.03 Å | (100) |
| 3.36 Å | (80) |
| 2.80 Å | (80) |
| 6.47 Å | (70) |
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 Laplandite-(Ce)
General Appearance of Type Material:
Radiating-fibrous deposits up to 0.5-1 cm and fan-shaped platy aggregates; the plates about 0.01 mm thick are flattened on the c axis.
Place of Conservation of Type Material:
Institute of Mineralogy and Geochemistry of Rare Elements, Moscow, Russia.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 75512, 76312.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 75512, 76312.
Geological Setting of Type Material:
Natrolite zone of a pegmatite in a differentiated alkalic massif.
Associated Minerals at Type Locality:
Synonyms of Laplandite-(Ce)
Other Language Names for Laplandite-(Ce)
Common Associates
Associations Based on Photo Data:
| 1 photo of Laplandite-(Ce) associated with Sazhinite-(Ce) | Na3CeSi6O15 · 2H2O |
| 1 photo of Laplandite-(Ce) associated with Serandite | NaMn2+2Si3O8(OH) |
| 1 photo of Laplandite-(Ce) associated with Manganoneptunite | KNa2Li(Mn2+)2Ti2[Si4O12]2 |
Related Minerals - Strunz-mindat Grouping
| 9.DJ.05 | Narsarsukite | Na2(Ti,Fe3+)Si4(O,F)11 |
| 9.DJ.15 | Caysichite-(Y) | (Ca,Yb,Er)4Y4(Si8O20)(CO3)6(OH) · 7H2O |
| 9.DJ.20 | Seidite-(Ce) | Na4(Ce,Sr)2[TiSi8O18(OH)2](O,OH,F)4 · 5H2O |
| 9.DJ.25 | Carlosturanite | (Mg,Fe,Ti)21(Si,Al)12O28(OH)34 · H2O |
| 9.DJ.30 | Jonesite | Ba4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 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 Laplandite-(Ce)
mindat.org URL:
https://www.mindat.org/min-2331.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Laplandite-(Ce)
Localities for Laplandite-(Ce)
Showing 2 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.
China | |
| Fengjun Nie et al. (2013) |
Russia (TL) | |
| Es’kova et al. (1974) +1 other reference |
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Yubileinaya pegmatite, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia