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Tsepinite-Na
A valid IMA mineral species
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About Tsepinite-Na
Formula:
Na2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O
Colour:
White, colourless, light brown
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.74
Crystal System:
Monoclinic
Member of:
Name:
Named after Anatoliy Ivanovich Tsepin (Анатолий Иванович Цепин) (b. 1946), physicist of the Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences (IGEM), specialist in X-ray spectroscopy and the electron-microprobe analysis of minerals, who initiated in the 1970s an electron-microprobe investigation of labuntsovite-group minerals.
Unique Identifiers
Mindat ID:
11013
Long-form identifier:
mindat:1:1:11013:6
Similar Names
| Tsepinite-Ca | A valid IMA mineral species | (Ca,K,Na)2-x(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O |
IMA Classification of Tsepinite-Na
Approved
IMA Formula:
(Na,H3O,K,Sr,Ba,◻)2(Ti4+,Nb5+)2(Si4O12)(OH,O)2·3H2O
Approval year:
2000
First published:
2001
Type description reference:
Classification of Tsepinite-Na
9.CE.30b
9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
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 |
|---|---|---|
| Tsp-Na | 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 Tsepinite-Na
Vitreous
Transparency:
Transparent, Translucent
Colour:
White, colourless, light brown
Streak:
White
Hardness:
5 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.74(2) g/cm3 (Measured) 2.72(1) g/cm3 (Calculated)
Optical Data of Tsepinite-Na
Type:
Biaxial (+)
RI values:
nα = 1.658(1) nβ = 1.668(1) nγ = 1.770(5)
2V:
Measured: 19° to 31°, Calculated: 36°
Max. Birefringence:
δ = 0.112
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:
Very 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.
Pleochroism:
Non-pleochroic
Chemistry of Tsepinite-Na
Mindat Formula:
Na2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O
Element Weights:
Common Impurities:
K,Sr,Ba
Crystallography of Tsepinite-Na
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bm
Setting:
Cm
Cell Parameters:
a = 14.604(7) Å, b = 14.274(8) Å, c = 7.933(2) Å
β = 117.40(3)°
β = 117.40(3)°
Ratio:
a:b:c = 1.023 : 1 : 0.556
Unit Cell V:
1468.2 ų
Z:
4
Morphology:
{001}, {100}, {201}, {010}, {012}, {241}
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) |
|---|---|---|---|---|---|---|---|
| 0012504 | Tsepinite-Na | Rastsvetaeva R K, Organova N I, Rozhdestvenskaya I V, Shlyukova Z V, Chukanov N V (2000) Crystal structure of oxonium mineral of the nenadkevichite-labuntsovite group from Khibiny massif Doklady Chemistry 371 52-56 | 2000 | Khibinpakhchorr mountain, Khibiny massif, Kola Peninsula, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.09 Å | (100) |
| 3.24 Å | (90) |
| 3.15 Å | (80) |
| 2.54 Å | (70) |
| 4.98 Å | (60) |
| 2.63 Å | (60) |
| 2.06 Å | (60) |
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 Tsepinite-Na
Co-Type Localities:
General Appearance of Type Material:
Radial aggregates and separate prismatic crystals (up to 1 cm).
Place of Conservation of Type Material:
A. E. Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
Alkaline pegmatite
Associated Minerals at Type Locality:
Synonyms of Tsepinite-Na
Other Language Names for Tsepinite-Na
Dutch:Tsepiniet-Na
German:Tsepinit-Na
Russian:Цепинит-Na
Simplified Chinese:水硅铌钛钠石
Traditional Chinese:水矽鈮鈦鈉石
Relationship of Tsepinite-Na to other Species
Member of:
Other Members of Vuoriyarvite Group:
| Tsepinite-Ca | (Ca,K,Na)2-x(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O | Mon. 2/m : B2/m |
| Tsepinite-K | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O | Mon. m : Bm |
| Tsepinite-Sr | Sr(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O | Mon. m : Bm |
| Vuoriyarvite-K | K2(Nb,Ti)2(Si4O12)(O,OH)2 · 4H2O | Mon. m : Bm |
Common Associates
Associations Based on Photo Data:
| 20 photos of Tsepinite-Na associated with Labuntsovite-Mn | Na4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O |
| 8 photos of Tsepinite-Na associated with Lemmleinite-Ba | Na2K2Ba(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2O |
| 5 photos of Tsepinite-Na associated with 'Saamite (of Volkova & Melentiev)' | (Ca,Sr,REE)5(PO4)3(F,O) |
| 3 photos of Tsepinite-Na associated with Manganoneptunite | KNa2Li(Mn2+)2Ti2[Si4O12]2 |
| 3 photos of Tsepinite-Na associated with Churchite-(Y) | Y(PO4) · 2H2O |
| 2 photos of Tsepinite-Na associated with Hilairite | Na2Zr[SiO3]3 · 3H2O |
| 1 photo of Tsepinite-Na associated with Monazite-(Ce) | Ce(PO4) |
| 1 photo of Tsepinite-Na associated with Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O |
| 1 photo of Tsepinite-Na associated with Burovaite-Ca | (Na,K)4Ca2(Ti,Nb)8(Si4O12)4(OH,O)8 · 12H2O |
| 1 photo of Tsepinite-Na associated with 'Arisite' |
Related Minerals - Strunz-mindat Grouping
| 9.CE. | Dutkevichite-(Ce) | NaZnBa2Ce2Ti2Si8O26F · H2O |
| 9.CE. | Katanite | Ba3NbFe3Si2O14 |
| 9.CE. | Niobobaotite | Ba4(Ti2.5Fe2+1.5)Nb4Si4O28Cl |
| 9.CE. | Amaterasuite | Sr4Ti6Si4O23(OH)Cl |
| 9.CE. | Steiningerite | Ba2Zr2(Si4O12)O2 |
| 9.CE.05 | Papagoite | CaCu[H3AlSi2O9] |
| 9.CE.10 | Verplanckite | Ba4Mn2+2Si4O12(OH,H2O)3Cl3 |
| 9.CE.15 | Baotite | Ba4(Ti,Nb,W)8O16(SiO3)4Cl |
| 9.CE.20 | Nagashimalite | Ba4(V,Ti)4B2Si8O27(O,OH)2Cl |
| 9.CE.20 | Taramellite | Ba4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2Clx |
| 9.CE.20 | Titantaramellite | Ba4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx |
| 9.CE.25 | Bario-orthojoaquinite | (Ba,Sr)4Fe2Ti2[Si4O12]2O2 · H2O |
| 9.CE.25 | Byelorussite-(Ce) | NaBa2Ce2MnTi2[Si4O12]2O2(F,OH) · H2O |
| 9.CE.25 | Joaquinite-(Ce) | NaBa2Ce2FeTi2[Si4O12]2O2(OH,F) · H2O |
| 9.CE.25 | Orthojoaquinite-(La) | NaBa2La2Fe2+Ti2[Si4O12]2O2(O,OH) · H2O |
| 9.CE.25 | Strontiojoaquinite | Sr2Ba2(Na,Fe)2Ti2[Si4O12]2O2(O,OH)2 · H2O |
| 9.CE.25 | Orthojoaquinite-(Ce) | NaBa2Ce2FeTi2[Si4O12]2O2(O,OH) · H2O |
| 9.CE.25 | Strontio-orthojoaquinite | (Na,Fe)2Sr2Ba2Ti2[Si4O12]2O2(O,OH)2 · H2O |
| 9.CE.30e | Labuntsovite-Mn | Na4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O |
| 9.CE.30c | Gjerdingenite-Na | K2Na(Nb,Ti)4(Si4O12)2(OH,O)4 · 5H2O |
| 9.CE.30h | Alsakharovite-Zn | NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O |
| 9.CE.30c | Burovaite-Ca | (Na,K)4Ca2(Ti,Nb)8(Si4O12)4(OH,O)8 · 12H2O |
| 9.CE.30a | Nenadkevichite | (Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O |
| 9.CE.30b | Tsepinite-Sr | Sr(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O |
| 9.CE.30c | Gjerdingenite-Mn | K2Mn2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O |
| 9.CE.30b | Paratsepinite-Na | (Na,Sr,K,Ca)7(Ti,Nb)8(Si4O12)4(O,OH)8 · nH2O n ~ 8 |
| 9.CE.30d | Lemmleinite-K | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O |
| 9.CE.30c | Karupmøllerite-Ca | (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 7H2O |
| 9.CE.30c | Lepkhenelmite-Zn | (Ba,K)2Zn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O |
| 9.CE.30h | Gutkovaite-Mn | K2CaMn(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2O |
| 9.CE.30e | Labuntsovite-Mg | Na4K4(Ba,K)2Mg(Ti,Nb)8(Si4O12)4(O,OH)8 · 10H2O |
| 9.CE.30e | Labuntsovite-Fe | Na4K4(Ba,K)2Fe2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10H2O |
| 9.CE.30c | Kuzmenkoite-Zn | K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4 · 6-8H2O |
| 9.CE.30f | Paralabuntsovite-Mg | Na8K8Mg4Ti16(Si4O12)8(OH,O)16 · 20-24H2O |
| 9.CE.30d | Lemmleinite-Ba | Na2K2Ba(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2O |
| 9.CE.30g | Organovaite-Mn | K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4 · 5-7H2O |
| 9.CE.30g | Organovaite-Zn | K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O |
| 9.CE.30b | Vuoriyarvite-K | K2(Nb,Ti)2(Si4O12)(O,OH)2 · 4H2O |
| 9.CE.30c | Gjerdingenite-Fe | K2Fe2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O |
| 9.CE.30a | 'Unnamed (Ca-Na-ordered analogue of Korobitsynite)' | (Ca,Na)2(Ti,Nb)2(Si4O12)(OH,O)2 · 3-4H2O |
| 9.CE.30g | Parakuzmenkoite-Fe | (K,Ba)4Fe(Ti,Nb)8(Si4O12)4(O,OH)8 · 14H2O |
| 9.CE.30a | Korobitsynite | (Na,◻)4Ti2(Si4O12)(O,OH)2 · 4H2O |
| 9.CE.30c | Kuzmenkoite-Mn | K2Mn2+(Ti,Nb)4(Si4O12)2(OH,O)4 · 5-6H2O |
| 9.CE.30b | Tsepinite-K | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O |
| 9.CE.30b | Paratsepinite-Ba | Ba4(Ti,Nb)8(Si4O12)4(OH,O)8 · 8H2O |
| 9.CE.30h | Neskevaaraite-Fe | K3Na2Fe2+(Ti,Nb)4(Si4O12)2(O,OH)4 · 5-6 H2O |
| 9.CE.30c | Gjerdingenite-Ca | K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O |
| 9.CE.30b | Tsepinite-Ca | (Ca,K,Na)2-x(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O |
| 9.CE.45 | 'Natrokomarovite' | (Na,Ca,H)2Nb2Si2O10(OH,F)2 · H2O |
| 9.CE.45 | Komarovite | (Ca,Mn)(Nb,Ti)2[Si2O7](O,F)3 · 3.5H2O |
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 Tsepinite-Na
mindat.org URL:
https://www.mindat.org/min-11013.html
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References for Tsepinite-Na
Reference List:
Shlyukova, Z. V., Chukanov, N. V., Pekov, I. V., Rastsvetaeva, R. K., Organova, N. I., Zadov, A. E. (2001) Tsepinite-Na (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3H2O, a new mineral of the labuntsovite group. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 130 (3) 43-50
Localities for Tsepinite-Na
Showing 7 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 | |
| Horváth (2001) |
Namibia | |
| Petersen et al. (2004) |
Russia (TL) | |
| Shlyukova et al. (2001) +3 other references |
| Pekov et al. (2004) | |
| Shlyukova et al. (2001) +1 other reference |
| Pekov et al. (2004) | |
| Semenov E.I. (1972) |
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Aris Quarries, Aris, Windhoek Rural, Khomas Region, Namibia