Petarasite Mineral Data

Petarasite Mineral Data +

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General Petarasite Information

Chemical Formula:

Na5Zr2Si6O18(Cl,OH)·2(H2O)

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

Empirical Formula:

Na_4.7Ca_0.1Zr₂Si₆O₁₈(OH)_0.6Cl_0.5·3(H₂O)

Environment:

In a biotite-microcline xenolith and in pegmatitic veins in a nepheline syenite.

IMA Status:

Approved IMA 1980

Locality:

Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Peter Tarasoff, amateur mineralogist, Dollard-des-Ormeaux, Quebec, Canada.

Synonym:

ICSD 20150

IMA1979-063

PDF 33-1310

Petarasite Image

Images:

Petarasite

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

Axial Ratios:

a:b:c =0.7448:1:0.4569

Cell Dimensions:

a = 10.7956, b = 14.4928, c = 6.6229, Z = 2; beta = 113.214° V = 952.32 Den(Calc)= 2.90

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.924(1), 4.1(1), 7.25(0.7),

Crystal Structure:

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Ghose S , Wan C , Chao G Y , The Canadian Mineralogist , 18 (1980) p.503-509, Petarasite, Na5Zr2Si6O18(Cl,OH).2H2O, a zeolite-type zirconosilicate

Physical Properties of Petarasite

Cleavage:

[110] Perfect, [010] Good, [001] Distinct

Color:

Brownish yellow, Greenish yellow.

Density:

2.88

Diaphaniety:

Transparent to Translucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Petarasite

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

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.

Pleochroism (x):

colorless.

Pleochroism (y):

pale greenish yellow.

Pleochroism (z):

pale greenish yellow.

Calculated Properties of Petarasite

Electron Density:

r_electron=2.80 gm/cc
note: r_Petarasite=2.88 gm/cc.

Fermion Index

Fermion Index = 0.03422
Boson Index = 0.96578

Photoelectric:

PE_Petarasite= 30.12 barns/electron
U=PE_Petarasite x r_electron= 84.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Petarasite is Not Radioactive

Petarasite Classification

Dana Class:

61.1.2b.3 (61)Cyclosilicate Six-Membered Rings

(61.1)with [Si6O18] rings; possible (OH) and Al substitution

(61.1.2b)Lovozerite group (Ortho and MON subgroup)

61.1.2b.1 Imandrite Na12Ca3Fe2Si12O36 Pnnm 2/m 2/m 2/m

61.1.2b.2 Koashvite Na6(Ca,Mn)(Ti,Fe)Si6O18·(H2O) Pmnb 2/m 2/m 2/m

61.1.2b.3 Petarasite Na5Zr2Si6O18(Cl,OH)·2(H2O) P 2₁/m 2/m

61.1.2b.4 Litvinskite! Na2([],Na,Mn)Zr[Si6O12(OH,O)6] Cm m

Strunz Class:

VIII/E.16-70 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.16 - Lovozerite group

VIII/E.16-10 Imandrite Na12Ca3Fe2Si12O36 Pnnm 2/m 2/m 2/m

VIII/E.16-20 Kazakovite Na6MnTiSi6O18 R 3m 3 2/m

VIII/E.16-23 Kapustinite! Na5.5Mn0.25ZrSi6O16(OH)2 C 2/m 2/m

VIII/E.16-25 Litvinskite! Na2([],Na,Mn)Zr[Si6O12(OH,O)6] Cm m

VIII/E.16-30 Lovozerite H4Na2Ca(Zr,Ti)[Si6O18] R 3m 3 2/m

VIII/E.16-40 Zirsinalite Na6(Ca,Mn,Fe)Zr[Si6O18] R 3m 3 2/m

VIII/E.16-50 Koashvite Na6(Ca,Mn)(Ti,Fe)Si6O18·(H2O) Pmnb 2/m 2/m 2/m

VIII/E.16-60 Tisinalite Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18·2(H2O) R 3m 3 2/m

VIII/E.16-70 Petarasite Na5Zr2Si6O18(Cl,OH)·2(H2O) P 2₁/m 2/m

Other Petarasite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Petarasite

Na5Zr2Si6O18(Cl,OH)·2(H2O)
Dana No: 61.1.2b.3 Strunz No: VIII/E.16-70
Locality:

Notes: