Tsepinite-Ca
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Tsepinite-Ca
Formula:
(Ca,K,Na)2-x(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O
Colour:
White, colourless, pale brownish
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.73
Crystal System:
Monoclinic
Member of:
Name:
Named for its relationship to previously described tsepinite-Na and tsepinite-K, with Ca dominant over Na or K. The root name is after Anatoliy Ivanovich Tsepin (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.
This page provides mineralogical data about Tsepinite-Ca.
Unique Identifiers
Mindat ID:
26367
Long-form identifier:
mindat:1:1:26367:8
Similar Names
| Tsepinite-K | A valid IMA mineral species | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O |
| Tsepinite-Na | A valid IMA mineral species | Na2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O |
IMA Classification of Tsepinite-Ca
Approved
IMA Formula:
(Ca,K,Na)2-x(Ti4+,Nb5+)2Si4O12(OH,O)2·4H2O
Approval year:
2002
First published:
2003
Type description reference:
Pekov, Igor V.; Chukanov, Nikita V.; Ferraris, Giovanni; Gula, Angela; Pushcharovsky, Dmitry Yu.; Zadov, Aleksandr E. (2003) Tsepinite–Ca, (Ca,K,Na,□)2(Ti,Nb)2(Si4O12)(OH,O)2·4H2O, a new mineral of the labuntsovite group from the Khibiny alkaline massif, Kola Peninsula – Novel disordered sites in the vuoriyarvite-type structure. Neues Jahrbuch für Mineralogie - Monatshefte, 2003 (10). p.461-480. doi:10.1127/0028-3649/2003/2003-0461
Classification of Tsepinite-Ca
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-Ca | 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-Ca
Vitreous
Transparency:
Transparent
Colour:
White, colourless, pale brownish
Streak:
White
Hardness:
5 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.73(1) g/cm3 (Measured) 2.72 g/cm3 (Calculated)
Optical Data of Tsepinite-Ca
Type:
Biaxial (+)
RI values:
nα = 1.666 nβ = 1.676 nγ = 1.78
2V:
Measured: 30° , Calculated: 36°
Max. Birefringence:
δ = 0.114
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.
Dispersion:
very weak: r < n.
Pleochroism:
Non-pleochroic
Chemistry of Tsepinite-Ca
Mindat Formula:
(Ca,K,Na)2-x(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O
Element Weights:
Common Impurities:
K,Na
Crystallography of Tsepinite-Ca
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 14.484 Å, b = 14.191 Å, c = 7.907 Å
β = 117.26°
β = 117.26°
Ratio:
a:b:c = 1.021 : 1 : 0.557
Unit Cell V:
1,444.72 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Combine both in sheaf-like clusters up to 2 x 6 mm large and chaotic open-worked aggregates up to 1 cm as maximum dimension.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0014929 | Tsepinite-Ca | Pekov I V, Chukanov N V, Ferraris G, Gula A, Pushcharovsky D Y, Zadov A E (2003) Tsepinite-Ca,(Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2*4H2O, a new mineral of the labuntsovite group from the Khibiny alkaline massif, Kola peninsula - novel disordered sites in the vuoriyarvite-type structure Kola Peninsula, Russia Neues Jahrbuch fur Mineralogie, Monatshefte 2003 461-480 | 2003 | Lovchorrite mine, Hackman Valley, Yukspor Mountian, Khibiny massif, | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.02 Å | (60) |
| 6.38 Å | (40) |
| 3.53 Å | (45) |
| 3.16 Å | (100) |
| 2.62 Å | (45) |
| 2.51 Å | (85) |
| 1.718 Å | (50) |
Reference:
Pekov, Igor V.; Chukanov, Nikita V.; Ferraris, Giovanni; Gula, Angela; Pushcharovsky, Dmitry Yu.; Zadov, Aleksandr E. (2003) Tsepinite–Ca, (Ca,K,Na,□)2(Ti,Nb)2(Si4O12)(OH,O)2·4H2O, a new mineral of the labuntsovite group from the Khibiny alkaline massif, Kola Peninsula – Novel disordered sites in the vuoriyarvite-type structure. Neues Jahrbuch für Mineralogie - Monatshefte, 2003 (10). p.461-480. doi:10.1127/0028-3649/2003/2003-0461
Comments:
From Type Description.
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-Ca
General Appearance of Type Material:
Coarse long-prismatic to needle-shaped crystals up to 0.2 x 0.6 x 5mm in size.
Place of Conservation of Type Material:
A. E. Fersman Mineralogical Museum, Moscow, Russia, 2877/1.
Geological Setting of Type Material:
In cavities of replaced rinkite.
Associated Minerals at Type Locality:
Reference:
Pekov, Igor V.; Chukanov, Nikita V.; Ferraris, Giovanni; Gula, Angela; Pushcharovsky, Dmitry Yu.; Zadov, Aleksandr E. (2003) Tsepinite–Ca, (Ca,K,Na,□)2(Ti,Nb)2(Si4O12)(OH,O)2·4H2O, a new mineral of the labuntsovite group from the Khibiny alkaline massif, Kola Peninsula – Novel disordered sites in the vuoriyarvite-type structure. Neues Jahrbuch für Mineralogie - Monatshefte, 2003 (10). p.461-480. doi:10.1127/0028-3649/2003/2003-0461
Synonyms of Tsepinite-Ca
Other Language Names for Tsepinite-Ca
Dutch:Tsepiniet-Ca
German:Tsepinit-Ca
Russian:Цепинит-Ca
Simplified Chinese:水硅铌钛钙石
Traditional Chinese:水矽鈮鈦鈣石
Relationship of Tsepinite-Ca to other Species
Member of:
Other Members of Vuoriyarvite Group:
| Tsepinite-K | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O | Mon. m : Bm |
| Tsepinite-Na | Na2(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:
| 3 photos of Tsepinite-Ca associated with Pyatenkoite-(Y) | Na5YTi[SiO3]6 · 6H2O |
| 3 photos of Tsepinite-Ca associated with Kentbrooksite | (Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2O |
| 1 photo of Tsepinite-Ca associated with Leifite | (Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2 |
| 1 photo of Tsepinite-Ca associated with Albite | Na(AlSi3O8) |
| 1 photo of Tsepinite-Ca associated with Manganoneptunite | KNa2Li(Mn2+)2Ti2[Si4O12]2 |
| 1 photo of Tsepinite-Ca associated with Arfvedsonite | NaNa2(Fe2+4Fe3+)Si8O22(OH)2 |
| 1 photo of Tsepinite-Ca associated with Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| 1 photo of Tsepinite-Ca associated with Aegirine | NaFe3+Si2O6 |
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.30b | Tsepinite-Na | Na2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O |
| 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.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 |
Fluorescence of Tsepinite-Ca
None
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-Ca
mindat.org URL:
https://www.mindat.org/min-26367.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Tsepinite-Ca
Reference List:
Pekov, Igor V.; Chukanov, Nikita V.; Ferraris, Giovanni; Gula, Angela; Pushcharovsky, Dmitry Yu.; Zadov, Aleksandr E. (2003) Tsepinite–Ca, (Ca,K,Na,□)2(Ti,Nb)2(Si4O12)(OH,O)2·4H2O, a new mineral of the labuntsovite group from the Khibiny alkaline massif, Kola Peninsula – Novel disordered sites in the vuoriyarvite-type structure. Neues Jahrbuch für Mineralogie - Monatshefte, 2003 (10). p.461-480. doi:10.1127/0028-3649/2003/2003-0461
Vaitieva, Yu. A., Chukanov, N. V., Vigasina, M. F., Varlamov, D. A., Volkov, S. N., Rastsvetaeva, R. K., Aksenov, S. M. (2024) Structural Features of Hydrated Representatives of the Labuntsovite Group: Refinement of Crystal Structures of Intermediate Members of the Tsepinite-Na–“Tsepinite-Ba”–Tsepinite-K Solid Solution. Journal of Structural Chemistry, 65 (7) 1357-1370 doi:10.1134/s0022476624070072
Localities for Tsepinite-Ca
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.
Namibia | |
| analysis by Pietro Vignola (CNR Milano) |
Russia | |
| Lykova et al. (2016) |
| Pekov et al. (2005) |
| Pekov et al. (2003) |
Spain | |
| Dill et al. (2023) |
| Dill et al. (2023) | |
| Dill et al. (2023) |
Quick NavTopAbout Tsepinite-CaUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Aris Quarries, Aris, Windhoek Rural, Khomas Region, Namibia