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Petarasite

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Formula:
Na5Zr2(Si6O18)(Cl,OH) · 2H2O
System:
Monoclinic
Colour:
Orange to brown
Hardness:
5 - 5½
Name:
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.

Classification of Petarasite

Approved
9.CJ.40

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
61.1.2b.3

61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
14.10.11

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
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First Recorded Occurrence of Petarasite

Year of Discovery:
1980

Physical Properties of Petarasite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Orange to brown
Hardness (Mohs):
5 - 5½

Crystallography of Petarasite

Crystal System:
Monoclinic
Cell Parameters:
a = 10.79Å, b = 14.49Å, c = 6.62Å
β = 113.21°
Ratio:
a:b:c = 0.745 : 1 : 0.457
Unit Cell Volume:
V 951.25 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
Image Loading

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

Optical Data of Petarasite

Type:
Biaxial (+)
RI values:
nα = 1.595 - 1.596 nβ = 1.598 - 1.600 nγ = 1.631 - 1.632
2V:
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:
Moderate
Dispersion:
r < v weak

Chemical Properties of Petarasite

Formula:
Na5Zr2(Si6O18)(Cl,OH) · 2H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Ca,K

Relationship of Petarasite to other Species

Chemically related to group(s):
Lovozerite GroupA3D3G2M(HxSi6O18) · nH2O (x = 0-6)
9.CJ.05BazziteBe3Sc2(Si6O18)
9.CJ.05BerylBe3Al2(Si6O18)
9.CJ.05IndialiteMg2Al3(AlSi5O18)
9.CJ.05StoppaniiteBe3Fe23+(Si6O18) · H2O
9.CJ.10Cordierite(Mg,Fe)2Al3(AlSi5O18)
9.CJ.10Sekaninaite(Fe,Mg)2Al3(AlSi5O18)
9.CJ.15aCombeiteNa2Ca2(Si6O18)0.5
9.CJ.15bImandriteNa12Ca3Fe23+(Si6O18)2
9.CJ.15aKazakoviteNa6Mn2+Ti(Si6O18)
9.CJ.15cKoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2O
9.CJ.15aLovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O
9.CJ.15aTisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O
9.CJ.15aZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)
9.CJ.15aLitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6
9.CJ.15aKapustiniteNa5(Na,Mn2+)<1Zr(H2Si6O18)
9.CJ.25BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
9.CJ.25KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
9.CJ.25AleksandroviteKCa7Sn2Li3Si12O36F2
9.CJ.30DioptaseCuSiO3 · H2O
9.CJ.35KostyleviteK2Zr(Si3O9) · H2O
9.CJ.45Gerenite-(Y)(Ca,Na)2(Y,REE)3Si6O18 · 2H2O
9.CJ.50OdintsoviteK2Na4Ca3Ti2Be4Si12O38
9.CJ.55MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6
9.CJ.60PezzottaiteCs(Be2Li)Al2(Si6O18)
14.10.1ZirconZrSiO4
14.10.2HafnonHfSiO4
14.10.3ZektzeriteLiNa(Zr,Ti,Hf)Si6O15
14.10.4ParakeldyshiteNa2ZrSi2O7
14.10.5VlasoviteNa2ZrSi4O11
14.10.6Keldyshite(Na,H)2ZrSi2O7
14.10.7GaidonnayiteNa2Zr(Si3O9) · 2H2O
14.10.8TerskiteNa4ZrSi6O16 · 2H2O
14.10.9ElpiditeNa2ZrSi6O15 · 3H2O
14.10.10HilairiteNa2Zr[SiO3]3 · 3H2O
14.10.12KhibinskiteK2ZrSi2O7
14.10.13WadeiteK2Zr(Si3O9)
14.10.14DalyiteK2ZrSi6O15
14.10.15KostyleviteK2Zr(Si3O9) · H2O
14.10.16UmbiteK2(Zr,Ti)Si3O9 · H2O
14.10.17ParaumbiteK3Zr2H(Si3O9)2 · nH2O
14.10.18GeorgechaoiteNaKZr[Si3O9] · 2H2O
14.10.19GittinsiteCaZrSi2O7
14.10.20CalciocatapleiiteCaZr(Si3O9) · 2H2O
14.10.21CalciohilairiteCaZr[SiO3]3 · 3H2O
14.10.22ArmstrongiteCaZr[Si6O15] · 3H2O
14.10.23Lemoynite(Na,K)2CaZr2Si10O26 · 5H2O
14.10.24CatapleiiteNa2Zr(Si3O9) · 2H2O
14.10.25BaghdaditeCa3(Zr,Ti)(Si2O7)O2
14.10.26LovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O
14.10.27Låvenite(Na,Ca)2(Mn2+,Fe2+)(Zr,Ti)(Si2O7)(O,OH,F)2
14.10.28PenkvilksiteNa4Ti2Si8O22 · 4H2O
14.10.29DarapiositeKNa2(Zn,Li)3(Mn,Zr)2[Si12O30]
14.10.30BaziriteBaZr(Si3O9)
14.10.31KomkoviteBaZr[Si3O9] · 3H2O
14.10.32ZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)
14.10.33Tranquillityite(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O4

Other Names for Petarasite

Name in Other Languages:

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.

References for Petarasite

Reference List:
CHAO, G.Y., CHEN, T.T., and BAKER, J. (1980) Petarasite, a new hydrated sodium zirconium hydroxychlorosilicate mineral from Mont St Hilaire, Quebec. Canadian Mineralogist, 18, 497 502.

GHOSE, S., WAN CHENG, and CHAO, G.Y. (1980) Petarasite, Na5Zr2Si6O18(Cl,OH).2H2O a zeolite type zirconosilicate. Canadian Mineralogist, 18, 503 509.

PERRAULT, G., CHAO, G.Y., and CHEN, T.T. (1981) Additional data on petarasite from Mont St. Hilaire, Quebec. Canadian Mineralogist, 19, 411 413.

KHOMYAKOV, A.P., KUROVA, T.A., SHUMYATSKAYA, N.G., VORONKOV, A.A., and PYATENKO, Yu.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 Petarasite

Specimens:
The following Petarasite specimens are currently listed for sale on minfind.com.

Localities for Petarasite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • 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.
Norway
 
  • 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
Portugal
 
  • Azores District
    • San Miguel Island
Samples collected by Luigi Chiappino and analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • 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.
www.koeln.netsurf.de/~w.steffens/lovo.htm
USA
 
  • New Mexico
    • Otero Co.
      • Cornudas Mts
Dr. W. Stoll (private communication 2001 & 2004)
Mineral and/or Locality  
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