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Peter Tarassoff
Na5Zr2(Si6O18)(Cl,OH) · 2H2O
Orange to brown, pink.
5 - 5½
Crystal System:
Named in 1980 by George Y. Chao, T. T. Chen, and J. Baker in honor of Dr. Peter Tarassoff [b. April 11, 1934 Canada] of Beaconsfield, Quebec, considered to be “the dean” of Mont Saint-Hilaire mineral collectors, for his long (40+ years) and sustained contributions to Mont Saint-Hilaire mineralogy.
Related to the Lovozerite Group.

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Classification of PetarasiteHide


9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions

61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution

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

Physical Properties of PetarasiteHide

Orange to brown, pink.
5 - 5½ on Mohs scale

Optical Data of PetarasiteHide

Biaxial (+)
RI values:
nα = 1.595 - 1.596 nβ = 1.598 - 1.600 nγ = 1.631 - 1.632
Measured: 29° to 43°, Calculated: 36° to 40°
Max Birefringence:
δ = 0.036
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r < v weak

Chemical Properties of PetarasiteHide

Na5Zr2(Si6O18)(Cl,OH) · 2H2O
IMA Formula:
Na5Zr2Si6O18(Cl,OH) · 2H2O
Common Impurities:

Crystallography of PetarasiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 10.79 Å, b = 14.49 Å, c = 6.62 Å
β = 113.21°
a:b:c = 0.745 : 1 : 0.457
Unit Cell V:
951.25 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of PetarasiteHide

Synonyms of PetarasiteHide

Other Language Names for PetarasiteHide

Relationship of Petarasite to other SpeciesHide

Chemically related to group(s):
Lovozerite GroupA3D3G2M(HxSi6O18) · nH2O (x = 0-6)

Common AssociatesHide

Associated Minerals Based on Photo Data:
Catapleiite11 photos of Petarasite associated with Catapleiite on
Aegirine5 photos of Petarasite associated with Aegirine on
Albite3 photos of Petarasite associated with Albite on
Polylithionite3 photos of Petarasite associated with Polylithionite on
Manganoneptunite2 photos of Petarasite associated with Manganoneptunite on
Analcime2 photos of Petarasite associated with Analcime on
Kentbrooksite2 photos of Petarasite associated with Kentbrooksite on
Serandite2 photos of Petarasite associated with Serandite on
Gaidonnayite2 photos of Petarasite associated with Gaidonnayite on
Lorenzenite1 photo of Petarasite associated with Lorenzenite on

Related Minerals - Nickel-Strunz GroupingHide

9.CJ.05BazziteBe3Sc2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05IndialiteMg2Al3(AlSi5O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05StoppaniiteBe3Fe3+2(Si6O18) · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.10Cordierite(Mg,Fe)2Al3(AlSi5O18)Orth. mmm (2/m 2/m 2/m) : Cccm
9.CJ.15aCombeiteNa2Ca2(Si6O18)0.5Trig. 3m (3 2/m) : R3m
9.CJ.15cKoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2OOrth.
9.CJ.15aLovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OMon.
9.CJ.15aTisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2OTrig.
9.CJ.15aLitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6Mon. m : Bm
9.CJ.15aKapustiniteNa5(Na,Mn2+)<1Zr(H2Si6O18)Mon. 2/m
9.CJ.25KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2Mon. 2/m : B2/b
9.CJ.25AleksandroviteKCa7Sn2Li3Si12O36F2Mon. 2/m : B2/b
9.CJ.30DioptaseCuSiO3 · H2OTrig. 3 : R3
9.CJ.35KostyleviteK2Zr(Si3O9) · H2OMon.
9.CJ.45Gerenite-(Y)(Ca,Na)2(Y,REE)3Si6O18 · 2H2OTric.
9.CJ.60PezzottaiteCs(Be2Li)Al2(Si6O18)Trig. 3 : R3

Related Minerals - Dana Grouping (8th Ed.)Hide

61.1.2b.2KoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2OOrth.

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
14.10.8TerskiteNa4ZrSi6O16 · 2H2OOrth.
14.10.9ElpiditeNa2ZrSi6O15 · 3H2OOrth.
14.10.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig.
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 PetarasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chao, G.Y., Chen, T.T., Baker, J. (1980) Petarasite, a new hydrated sodium zirconium hydroxychlorosilicate mineral from Mont St Hilaire, Quebec. The Canadian Mineralogist: 18: 497 502.
Ghose, S., Wan, C., Chao, G.Y. (1980) Petarasite, Na5Zr2Si6O18(Cl,OH).2H2O a zeolite type zirconosilicate. The Canadian Mineralogist: 18: 503 509.
Fleischer, M., Cabri, L.J. (1981) New mineral names. American Mineralogist: 66: 1274-1280.
Perrault, G., Chao, G.Y., Chen, T.T. (1981) Additional data on petarasite from Mont St. Hilaire, Quebec. The Canadian Mineralogist: 19: 411 413.
Khomyakov, A.P., Kurova, T.A., Shumyatskaya, N.G., Voronkov, A.A., Pyatenko, Y.A. (1981) On a new natural zirconosilicate Na5Zr2[Si6O18]Cl•2H2O and its crystal structure. Doklady Akademii Nauk SSSR: 257: 622-624. [in Russian, petarasite]
Horváth, L. (2003) Who’s who in mineral names: Peter Tarassoff (petarasite). Rocks & Minerals: 81: 141-143.
Lin, Z., Domingues, J.P., Rocha, J., Carlos, L.D. (2007) A zirconosilicate system suitable for lanthanide framework incorporation. Journal of Luminescence: 122-123: 902-904.

Internet Links for PetarasiteHide

Localities for PetarasiteHide

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.
Canada (TL)
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Chao, G.Y. and Chen, T.T. (1980), Petarasite, a new hydrated sodium zirconium hydroxylchlorosilicate mineral from Mont St. Hilaire, Quebec. Canadian Mineralogist: 18: 497-502; Perrault, G., Chao G.Y. and Chen T.T. (1981), Additional data on petarasite from Mont St. Hilaire, Quebec. Canadian Mineralogist: 19: 411-413.
  • Vestfold
    • Larvik
      • Malerød
Larsen, A.O. (ed.) (2010): "The Langesundsfjord, History, Geology, Pegmatites, Minerals" , Bode Verlag GmBH.;Andresen, P. (2011): Mineralene fra Midtfjellet larvikittbrudd, Malerød, Larvik. Norsk Bergverksmuseum Skrift. 46: 41-47
  • Azores District
    • São Miguel Island
      • Água de Pau Massif
Chiappino, L., Astolfi, M., Bracco, R., Marchesini, M. & Selmi, P. (2015): I minerali del Vulcano di Fogo (Agua de Pau), São Miguel,Azzorre, Portogallo. Rivista Mineralogica Italiana 39(4), 220-250 (in Italian). Samples collected by Luigi Chiappino and analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
        • Kukisvumchorr Mt
          • East slope
            • Tuliok River head
Pavel M. Kartashov data
Хомяков А.П., Курова Т.Ф., Шумяцкая Р.Г. и др. (1981) О новом цирконосиликате Na5Zr2[Si6O18]Clx2H2O и его кристаллической структуре,- ДАН СССРб т.257, №3, с. 622-624.
  • New Mexico
    • Otero Co.
      • Cornudas Mts
Dr. W. Stoll (private communication 2001 & 2004)
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