Mineralogy Database

Petarasite Mineral Data

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General Petarasite Information

Help on Chemical  Formula: Chemical Formula: Na5Zr2Si6O18(Cl,OH)•2(H2O)
Help on Composition: Composition: Molecular Weight = 832.99 gm
   Sodium     12.97 %  Na   17.49 % Na2O
   Calcium     0.48 %  Ca    0.67 % CaO
   Zirconium  21.90 %  Zr   29.59 % ZrO2
   Silicon    20.23 %  Si   43.28 % SiO2
   Hydrogen    0.80 %  H     7.14 % H2O
   Chlorine    2.13 %  Cl    2.13 % Cl
                -   %   Cl   -0.48 % -O=Cl2   
   Oxygen     41.49 %  O
             ______        ______ 
             100.00 %       99.81 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na4.7Ca0.1Zr2Si6O18(OH)0.6Cl0.5•3(H2O)
Help on Environment: Environment: In a biotite-microcline xenolith and in pegmatitic veins in a nepheline syenite.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Peter Tarasoff, amateur mineralogist, Dollard-des-Ormeaux, Quebec, Canada.
Help on Name Pronunciation: Name Pronunciation: Petarasite + Pronunciation Say PETARASITE
Help on Synonym: Synonym: ICSD 20150
  PDF 33-1310

Petarasite Image

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Comments: Mottled tan prismatic petarasite crystal in syenite rock.
Location: De Mix Quarry, Mont Saint Hilaire, Rouville County, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Petarasite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7448:1:0.4569
Help on Cell Dimensions: Cell Dimensions: a = 10.7956, b = 14.4928, c = 6.6229, Z = 2; beta = 113.214° V = 952.32 Den(Calc)= 2.90
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.924(1), 4.1(1), 7.25(0.7),

Physical Properties of Petarasite

Help on Cleavage: Cleavage: {110} Perfect, {010} Good, {001} Distinct
Help on Color: Color: Brownish yellow, Greenish yellow.
Help on Density: Density: 2.88
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Petarasite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2099,KPDmeas= 0.2113,KC= 0.2181
Ncalc = 1.63
Help on Optical Data: Optical Data: Biaxial (+), a=1.595-1.596, b=1.598-1.6, g=1.631-1.632, bire=0.0360, 2V(Calc)=36-40, 2V(Meas)=29-43. Dispersion r < v weak.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): pale greenish yellow.
Help on Pleochroism (z): Pleochroism (z): pale greenish yellow.

Calculated Properties of Petarasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Petarasite =2.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEPetarasite = 30.12 barns/electron
U=PEPetarasite x rElectron Density= 84.49 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Petarasite is Not Radioactive

Petarasite Classification

Help on  Dana Class: Dana Class: 61.01.02b.03 (61)Cyclosilicate Six-Membered Rings
  (61.01)with [Si6O18] rings; possible (OH) and Al substitution
  (61.01.02b)Lovozerite group (Ortho and MON subgroup)
61.01.02b.01 Imandrite Na12Ca3Fe2Si12O36 Pnnm 2/m 2/m 2/m
61.01.02b.02 Koashvite Na6(Ca,Mn)(Ti,Fe)Si6O18•(H2O) Pmnb 2/m 2/m 2/m
61.01.02b.03 Petarasite Na5Zr2Si6O18(Cl,OH)•2(H2O) P 21/m 2/m
61.01.02b.04 Litvinskite! Na2([],Na,Mn)Zr[Si6O12(OH,O)6] Cm m
Help on  Strunz Class: Strunz Class: 09.CJ.40 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe),
09.CJ.40 Petarasite Na5Zr2Si6O18(Cl,OH)•2(H2O) P 21/m 2/m

Other Petarasite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Petarasite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: 61.01.02b.03 Strunz No: 09.CJ.40





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