Terskite
A valid IMA mineral species
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About Terskite
Formula:
Na4ZrSi6O16 · 2H2O
Colour:
White, pale lilac to violet
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.71
Crystal System:
Orthorhombic
Name:
Named after its discovery locality, near the Terski coast of the White sea (southeastern Kola Peninsula). Tersk is an old name for the Kola peninsula.
This page provides mineralogical data about Terskite.
Unique Identifiers
Mindat ID:
3915
Long-form identifier:
mindat:1:1:3915:0
Similar Names
| Traskite | A valid IMA mineral species | Ba21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6 · 14H2O |
IMA Classification of Terskite
Approved
IMA Formula:
Na4Zr4+Si6O14(OH)4
Approval year:
1982
First published:
1983
Classification of Terskite
9.DM.40
9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
78.7.15.1
78 : Unclassified Silicates
7 :
78 : Unclassified Silicates
7 :
14.10.8
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
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 |
|---|---|---|
| Ter | 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 Terskite
Vitreous
Transparency:
Translucent
Colour:
White, pale lilac to violet
Hardness:
5 on Mohs scale
Hardness:
VHN40=426 - 519 kg/mm2 - Vickers
Density:
2.71 g/cm3 (Measured) 2.74 g/cm3 (Calculated)
Optical Data of Terskite
Type:
Biaxial (-)
RI values:
nα = 1.576(2) nβ = 1.582(2) nγ = 1.584(2)
2V:
Measured: 53°
Max. Birefringence:
δ = 0.008
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.
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.
Surface Relief:
Moderate
Dispersion:
very weak r > v
Chemistry of Terskite
Mindat Formula:
Na4ZrSi6O16 · 2H2O
Element Weights:
Common Impurities:
Mn
Crystallography of Terskite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pnc2
Cell Parameters:
a = 14.195(8) Å, b = 14.750(5) Å, c = 7.511(2) Å
Ratio:
a:b:c = 0.962 : 1 : 0.509
Unit Cell V:
1,572.63 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals platy
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) |
|---|---|---|---|---|---|---|---|
| 0012483 | Terskite | Pudovkina Z V, Chernitsova N M (1991) Crystal structure of terskite Na4Zr[H4Si6O18] Doklady Akademii Nauk SSSR 316 645-649 | 1991 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.11 Å | (40) |
| 6.67 Å | (35) |
| 4.88 Å | (35) |
| 4.09 Å | (60) |
| 3.53 Å | (35) |
| 3.506 Å | (50) |
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 Terskite
Co-Type Localities:
General Appearance of Type Material:
Plates, 1-3.5 mm.
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, Russia, 5778/1.
Mineralogical Museum, St. Petersburg University, St. Petersburg, Russia, 17090.
Mining Institute, St. Petersburg, Russia, 1034/1.
Vernadsky Geological Museum, Moscow, Russia, 57773.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 82755.
Mineralogical Museum, St. Petersburg University, St. Petersburg, Russia, 17090.
Mining Institute, St. Petersburg, Russia, 1034/1.
Vernadsky Geological Museum, Moscow, Russia, 57773.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 82755.
Geological Setting of Type Material:
Veins in pegmatites of syenites.
Associated Minerals at Type Locality:
Synonyms of Terskite
Other Language Names for Terskite
Common Associates
Associations Based on Photo Data:
| 25 photos of Terskite associated with Hydroterskite | Na2ZrSi6O12(OH)6 |
| 19 photos of Terskite associated with Aegirine | NaFe3+Si2O6 |
| 17 photos of Terskite associated with Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| 12 photos of Terskite associated with Lovozerite Group | A3D3G2M(HxSi6O18) · nH2O (x = 0-6) |
| 12 photos of Terskite associated with Raite | Mn2+Mn2+2Na2(◻1.75Ti0.25)Si8O20(OH)2(H2O)4 · Na(H2O)6 |
| 8 photos of Terskite associated with Litvinskite | Na2(◻,Na,Mn)ZrSi6O12(OH,O)6 |
| 6 photos of Terskite associated with Gaidonnayite | Na2Zr(Si3O9) · 2H2O |
| 6 photos of Terskite associated with Sodalite | Na4(Si3Al3)O12Cl |
| 6 photos of Terskite associated with Clinoptilolite-Ca | Ca3(Si30Al6)O72 · 20H2O |
| 4 photos of Terskite associated with Manganoneptunite | KNa2Li(Mn2+)2Ti2[Si4O12]2 |
Related Minerals - Strunz-mindat Grouping
| 9.DM. | Kesebolite-(Ce) | CeCa2Mn(AsO4)(SiO3)3 |
| 9.DM.05 | Stokesite | CaSn[Si3O9] · 2H2O |
| 9.DM.10 | Calciohilairite | CaZr[SiO3]3 · 3H2O |
| 9.DM.10 | Pyatenkoite-(Y) | Na5YTi[SiO3]6 · 6H2O |
| 9.DM.10 | Hilairite | Na2Zr[SiO3]3 · 3H2O |
| 9.DM.10 | Komkovite | BaZr[Si3O9] · 3H2O |
| 9.DM.10 | Sazykinaite-(Y) | Na5YZr[SiO3]6 · 6H2O |
| 9.DM.15 | Plumbogaidonnayite | PbZrSi3O9 · 2H2O |
| 9.DM.15 | Gaidonnayite | Na2Zr(Si3O9) · 2H2O |
| 9.DM.15 | Georgechaoite | NaKZr[Si3O9] · 2H2O |
| 9.DM.20 | Chkalovite | Na2BeSi2O6 |
| 9.DM.25 | Vlasovite | Na2ZrSi4O11 |
| 9.DM.30 | Revdite | Na16Si16O27(OH)26 · 28H2O |
| 9.DM.35 | Scheuchzerite | Na(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3 |
| 9.DM.40 | Hydroterskite | Na2ZrSi6O12(OH)6 |
Fluorescence of Terskite
Bright green or pale yellow fluorescence
Other Information
Thermal Behaviour:
Distinct endothermic effects at 130°C and 410°C, and a weak endothermic effect at 830°C.
Notes:
Insoluble in 10% HCl or HNO3 solution.
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 Terskite
mindat.org URL:
https://www.mindat.org/min-3915.html
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References for Terskite
Reference List:
Dunn, Pete J., Grice, Joel D. Fleischer, Michael, Pabst, Adolf (1984) New mineral names. American Mineralogist, 69 (1-2) 210-215
Localities for Terskite
Showing 8 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 | |
| Ducharme (2020) |
| Grice (1989) +1 other reference |
| Horváth et al. (1998) |
| Horváth et al. (1998) | |
Greenland | |
| Semenov (2001) +1 other reference |
Russia (TL) | |
| [World of Stones 95:5-6 +3 other references |
| Pekov (1998) |
| RØNSBO et al. (1979) +3 other references |
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Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada