Tsepinite-Ca (original) (raw)

A valid IMA mineral species

About Tsepinite-CaHide

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Formula:

Ca(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O

Colour:

White, colourless, pale brownish

Crystal System:

Monoclinic

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 IdentifiersHide

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Long-form identifier:

mindat:1:1:26367:8

924acc46-3734-46df-bbba-7ea486fde067

IMA Classification of Tsepinite-CaHide

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IMA Formula:

(Ca,K,Na)2-x(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O

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) 461-480 doi:10.1127/0028-3649/2003/2003-0461

Classification of Tsepinite-CaHide

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9.CE.30b

9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of Tsepinite-CaHide

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Colour:

White, colourless, pale brownish

Fracture:

Irregular/Uneven

Density:

2.73(1) g/cm3 (Measured) 2.72 g/cm3 (Calculated)

Optical Data of Tsepinite-CaHide

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RI values:

_n_α = 1.666 _n_β = 1.676 _n_γ = 1.780

2V:

Measured: 30° , Calculated: 36°

δ = 0.114

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

very weak: r < n.

Pleochroism:

Non-pleochroic

Chemistry of Tsepinite-CaHide

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Mindat Formula:

Ca(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O

Crystallography of Tsepinite-CaHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 14.484 Å, b = 14.191 Å, c = 7.907 Å
β = 117.26°

Ratio:

a:b:c = 1.021 : 1 : 0.557

Unit Cell V:

1,444.72 ų (Calculated from Unit Cell)

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 StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

From Type Description.

Geological EnvironmentHide

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Type Occurrence of Tsepinite-CaHide

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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, 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. Neues Jahrbuch für Mineralogie-Monatshefte: 2003(10): 461-480.

Synonyms of Tsepinite-CaHide

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Other Language Names for Tsepinite-CaHide

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Relationship of Tsepinite-Ca to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of Tsepinite-CaHide

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Other InformationHide

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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-CaHide

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References for Tsepinite-CaHide

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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) 461-480 doi:10.1127/0028-3649/2003/2003-0461

Localities for Tsepinite-CaHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- 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). 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.