Seidite-(Ce)
A valid IMA mineral species
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About Seidite-(Ce)
Formula:
Na4(Ce,Sr)2[TiSi8O18(OH)2](O,OH,F)4 · 5H2O
Colour:
Bright yellow, pinkish yellow, creamy-white
Lustre:
Silky
Hardness:
3 - 4
Specific Gravity:
2.76
Crystal System:
Monoclinic
Name:
Named after Seidozero, literally Lake Seid, the central lake in the Lovozero complex.
This page provides mineralogical data about Seidite-(Ce).
Unique Identifiers
Mindat ID:
7284
Long-form identifier:
mindat:1:1:7284:3
GUID
(UUID V4):
(UUID V4):
16f100d0-0d2d-493c-83fd-65f30db4cd30
Classification of Seidite-(Ce)
Approved
Approval year:
1993
First published:
1998
9.DJ.20
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
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 |
|---|---|---|
| Sei-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 Seidite-(Ce)
Silky
Transparency:
Translucent
Comment:
Resinous or dull in some specimens
Colour:
Bright yellow, pinkish yellow, creamy-white
Hardness:
3 - 4 on Mohs scale
Cleavage:
Perfect
Perfect {100} and less perfect {001}
Perfect {100} and less perfect {001}
Fracture:
Splintery, Fibrous
Density:
2.76 g/cm3 (Measured) 2.73 g/cm3 (Calculated)
Optical Data of Seidite-(Ce)
Type:
Biaxial (-)
RI values:
nα = 1.542(2) nβ = 1.569(2) nγ = 1.571(2)
2V:
Measured: 28° (1), Calculated: 31°
Max Birefringence:
δ = 0.029
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:
Low
Dispersion:
weak
Comments:
positive elongation, X ≈ a, Y ≈ c, Z ≈ b.
Chemical Properties of Seidite-(Ce)
Formula:
Na4(Ce,Sr)2[TiSi8O18(OH)2](O,OH,F)4 · 5H2O
IMA Formula:
Na4(Ce,Sr)2TiSi8O18(O,OH,F)6 · 5H2O
Crystallography of Seidite-(Ce)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 24.71(1) Å, b = 7.186(3) Å, c = 14.47(2) Å
β = 95.25(10)°
β = 95.25(10)°
Ratio:
a:b:c = 3.439 : 1 : 2.014
Unit Cell V:
2,558.60 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Type material: individual fibers are up to 0.05 mm thick, elongate [010], and flattened {100}.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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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) |
|---|---|---|---|---|---|---|---|
| 0005884 | Seidite-(Ce) | Ferraris G, Belluso E, Gula A, Soboleva S V, Khomyakov A P (2003) The crystal structure of seidite-(Ce), Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4.5H2O, a modular microporous titanosilicate of the rhodesite group The Canadian Mineralogist 41 1183-1192 |  | 2003 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.32 Å | (100) |
| 6.93 Å | (30B) |
| 3.11 Å | (24) |
| 7.22 Å | (20B) |
| 6.20 Å | (20B) |
| 3.23 Å | (20B) |
| 3.08 Å | (16) |
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 Seidite-(Ce)
General Appearance of Type Material:
Bright yellow, pinkish yellow, or cream-colored spherulites to 1 cm, in cavernous natrolite.
Place of Conservation of Type Material:
Museum of the St. Petersburg Mining Institute, Russia.
Geological Setting of Type Material:
Ultraagpaitic pegmatite.
Associated Minerals at Type Locality:
Reference:
Khomyakov, A.P., Ferraris, G., Belluso, E., Britvin, S.N., Nechelyustov, G.N., Soboleva, S.V. (1998) Seidite-(Ce), Na4SrCeTiSi8O22F·5H2O, a new mineral with zeolitic properties. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva: 127(4): 94-100.
Synonyms of Seidite-(Ce)
Other Language Names for Seidite-(Ce)
German:Seidit-(Ce)
Russian:Сейдит-(Ce)
Common Associates
Associated Minerals Based on Photo Data:
| 6 photos of Seidite-(Ce) associated with Manganoneptunite | Na2KLiMn2+2Ti2Si8O24 |
| 3 photos of Seidite-(Ce) associated with Abellaite | NaPb2(CO3)2(OH) |
| 3 photos of Seidite-(Ce) associated with Galena | PbS |
| 3 photos of Seidite-(Ce) associated with Natrolite | Na2Al2Si3O10 · 2H2O |
| 1 photo of Seidite-(Ce) associated with Raite | Na4Mn2+3Ti0.25Si8O20(OH)2 · 10H2O |
Related Minerals - Strunz-mindat Grouping
| 9.DJ.05 | Narsarsukite | Na4(Ti,Fe)2[Si8O20](O,OH,F)2 | Tet. 4/m : I4/m |
| 9.DJ.10 | Laplandite-(Ce) | Na4CeTiPO4Si7O18 · 5H2O | Orth. mmm (2/m 2/m 2/m) : Pmmm |
| 9.DJ.15 | Caysichite-(Y) | (Ca,Yb,Er)4Y4(Si8O20)(CO3)6(OH) · 7H2O | Orth. mm2 |
| 9.DJ.25 | Carlosturanite | (Mg,Fe,Ti)21(Si,Al)12O28(OH)34 · H2O | Mon. m : Bm |
| 9.DJ.30 | Jonesite | Ba4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 6H2O | Mon. 2/m : P2/m |
Fluorescence of Seidite-(Ce)
Nonfluorescent
Other Information
Thermal Behaviour:
The DTA curve has a strong endotherm at 180°C (dehydration) and weak ones at 650, 740, and 840°C (incongruent melting). Weight loss between 20 and 200°C is 8.2%, and total loss to 1000°C is 11.1 wt%. Readily rehydrates after heating to 300°C.
Notes:
Readily soluble in 10% HCl or HNO3, reacts with H2O.
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 Seidite-(Ce)
mindat.org URL:
https://www.mindat.org/min-7284.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
References for Seidite-(Ce)
Reference List:
Localities for Seidite-(Ce)
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.
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Yubileinaya pegmatite, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia