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Na4ZrSi6O16 · 2H2O
White, pale lilac to violet
Crystal System:
Named after its discovery locality, near the Terski coast of the White sea. Tersk is an old name for the Kola peninsula.
This page provides mineralogical data about Terskite.

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Classification of TerskiteHide

Approval Year:

9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains

78 : Unclassified Silicates
7 :

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf

Physical Properties of TerskiteHide

White, pale lilac to violet

Optical Data of TerskiteHide

Biaxial (-)
RI values:
nα = 1.576 nβ = 1.582 nγ = 1.584
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
very weak

Chemical Properties of TerskiteHide

Na4ZrSi6O16 · 2H2O
Common Impurities:

Crystallography of TerskiteHide

Crystal System:
Cell Parameters:
a = 14.19 Å, b = 14.75 Å, c = 7.51 Å
a:b:c = 0.962 : 1 : 0.509
Unit Cell V:
1,571.86 ų (Calculated from Unit Cell)

Type Occurrence of TerskiteHide

Synonyms of TerskiteHide

Other Language Names for TerskiteHide

Simplified Chinese:突硅钠锆石
Traditional Chinese:突矽鈉鋯石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Aegirine16 photos of Terskite associated with Aegirine on
Eudialyte12 photos of Terskite associated with Eudialyte on
Litvinskite7 photos of Terskite associated with Litvinskite on
Microcline6 photos of Terskite associated with Microcline on
Ussingite3 photos of Terskite associated with Ussingite on
Lamprophyllite2 photos of Terskite associated with Lamprophyllite on
Hackmanite2 photos of Terskite associated with Hackmanite on
Gaidonnayite2 photos of Terskite associated with Gaidonnayite on
Zorite1 photo of Terskite associated with Zorite on
Raite1 photo of Terskite associated with Raite on

Related Minerals - Nickel-Strunz GroupingHide

9.DM.05StokesiteCaSn[Si3O9] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.DM.10CalciohilairiteCaZr[SiO3]3 · 3H2OTrig.
9.DM.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig.
9.DM.10KomkoviteBaZr[Si3O9] · 3H2OTrig.
9.DM.10Sazykinaite-(Y)Na5YZr[SiO3]6 · 6H2O
9.DM.10Pyatenkoite-(Y)Na5YTi[SiO3]6 · 6H2OTrig.
9.DM.15GaidonnayiteNa2Zr(Si3O9) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pmna
9.DM.15GeorgechaoiteNaKZr[Si3O9] · 2H2OOrth. mm2
9.DM.20ChkaloviteNa2BeSi2O6Orth. mm2 : Fdd2
9.DM.25VlasoviteNa2ZrSi4O11Mon. 2/m : B2/b
9.DM.30RevditeNa16Si16O27(OH)26 · 28H2OMon. 2 : B2
9.DM.35ScheuchzeriteNa(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.10.1ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
14.10.2HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
14.10.5VlasoviteNa2ZrSi4O11Mon. 2/m : B2/b
14.10.6Keldyshite(Na,H)2ZrSi2O7Tric. 1 : P1
14.10.7GaidonnayiteNa2Zr(Si3O9) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pmna
14.10.9ElpiditeNa2ZrSi6O15 · 3H2OOrth.
14.10.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig.
14.10.11PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
14.10.15KostyleviteK2Zr(Si3O9) · H2OMon.
14.10.16UmbiteK2(Zr,Ti)Si3O9 · H2OOrth.
14.10.17ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth.
14.10.18GeorgechaoiteNaKZr[Si3O9] · 2H2OOrth. mm2
14.10.20CalciocatapleiiteCaZr(Si3O9) · 2H2O
14.10.21CalciohilairiteCaZr[SiO3]3 · 3H2OTrig.
14.10.22ArmstrongiteCaZr[Si6O15] · 3H2OMon.
14.10.23Lemoynite(Na,K)2CaZr2Si10O26 · 5H2OMon. 2/m : B2/b
14.10.24CatapleiiteNa2Zr(Si3O9) · 2H2OMon.
14.10.26LovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OMon.
14.10.27Låvenite(Na,Ca)2(Mn2+,Fe2+)(Zr,Ti)(Si2O7)(O,OH,F)2Mon. 2/m : P21/b
14.10.28PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
14.10.29DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
14.10.31KomkoviteBaZr[Si3O9] · 3H2OTrig.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TerskiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
KHOMYAKOV, A.P., SEMENOV, E.I., VORONIKOV, A.A. & NECHELLYUSTOV, G.N. (1983): Terskite, Na4ZrSi6O16·H2O, a new mineral. International Geology Review 25, 1162 1167 [English]. [Abstract: American Mineralogist (1984), 69, 212.
KHOMYAKOV, A.P., SEMENOV, E.I., VORONIKOV, A.A. & NECHELLYUSTOV, G.N. (1983): Terskite, Na4ZrSi6O16·H2O, a new mineral.Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 112, 226-232 [Russian].
American Mineralogist (1992): 77: 452.
Doklady Akademii Nauk SSSR: 317: 645-649.
Soviet Physics – Doklady: 36: 201-203.

Internet Links for TerskiteHide

Localities for TerskiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
      • Lajemmerais RCM
        • Varennes & St-Amable
HORVÁTH, L., PFENNINGER HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83 118.
Horváth, L., Pfenninger-Horváth, E., Gault, R. A., & Tarassoff, P. (1998): Mineralogy of the Saint-Amable Sill, Varennes and Saint-Amable, Québec. Mineralogical Record, 29: 83-118.
  • Kujalleq
    • Narsaq
Semenov, E. (2001): Notes on Ephesite, Terskite, Na-Komarovite, Ceriopyrochlore-(Ce), Joaquinite-(Ce) and other minerals from the Ilimaussaq alkaline complex, South Greenland, Geology of Greenland Survey Bulletin 190, 123-125; Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
Russia (TL)
  • Northern Region
    • Murmanskaya Oblast'
      • Lovozero Massif
[World of Stones 95:5-6, p64]
          • Umbozero mine (Umbozerskii mine; Umba Mine)
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
        • Karnasurt Mt
RØNSBO, J.G., KHOMYAKOV, A.P., SEMENOV, E.I., VORONKOV, A.A., and GARANIN, V.K (1979) Vitusite, a new phosphate of sodium and rare earths from the Lovozero alkaline massif, Kola and Ilímaussaq alkaline intrusion, South Greenland. Neues Jahrbuch für Mineralogie, Abhandlungen, 137, (1) 42-53. Abstract in: American Mineralogist (1980): 65: 812. Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Zubkova, N. V., Pekov, I. V., Pushcharovsky, D. Y., & Chukanov, N. V. (2009). The crystal structure and refined formula of mountainite, KNa2Ca2 [Si8O19 (OH)]⊙ 6 H2O. Zeitschrift für Kristallographie, 224(8), 389-396.
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