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Perraultite Mineral Data

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General Perraultite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca)2(Ba,K)2(Mn++,Fe++)8(Ti,Nb)4Si8O32(OH,F,O)6
Help on Composition: Composition: Molecular Weight = 1,766.01 gm
   Potassium   1.11 %  K     1.33 % K2O
   Barium     11.66 %  Ba   13.02 % BaO
   Sodium      1.95 %  Na    2.63 % Na2O
   Calcium     1.13 %  Ca    1.59 % CaO
   Titanium   10.30 %  Ti   17.19 % TiO2
   Manganese  15.55 %  Mn   20.08 % MnO
   Niobium     1.05 %  Nb    1.51 % Nb2O5
   Iron        9.49 %  Fe   12.20 % FeO
   Silicon    12.72 %  Si   27.22 % SiO2
   Hydrogen    0.26 %  H     2.30 % H2O
   Oxygen     32.61 %  O
   Fluorine    2.15 %  F     2.15 % F
                -   %   F    -0.91 % -O=F2    
             ______        ______ 
             100.00 %      100.32 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.5K0.5Ca0.5Ba1.5Mn2+5Fe2+3Ti3.8Nb0.2Si8O32(OH)3.5F2(H2O)0.5
Help on Environment: Environment: In pegmatite dikes. Probable analog of jinshajiangite.
Help on IMA Status: IMA Status: Approved IMA 1991
Help on Locality: Locality: DeMix quarry, Mont Saint Hilaire, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Guy Perault (1937-) of Ecole Polytechnique, Montreal, Canada.
Help on Name Pronunciation: Name Pronunciation: Perraultite + Pronunciation Say PERRAULTITE
Help on Synonym: Synonym: ICSD 87533
  IMA1984-033
  PDF 45-1346
 

Perraultite Image

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  Perraultite

Comments: Dark red prismatic crystal of perraultite to 1mm in matrix.
Location: Mariupol massif, Azov Sea Region, Ukraine. Scale: Picture size 3 mm.
© Tom Loomis / Dakota Matrix

Perraultite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7492:1:1.7536
Help on Cell Dimensions: Cell Dimensions: a = 10.371, b = 13.841, c = 24.272, Z = 4; beta = 121.19° V = 2,980.51 Den(Calc)= 3.94
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: C 2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.474(1), 10.43(0.42), 2.606(0.4),
 

Physical Properties of Perraultite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Orange brown.
Help on Density: Density: 3.71
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light brown
 

Optical Properties of Perraultite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.1 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2043,KPDmeas= 0.217,KC= 0.2271
Ncalc = 1.84 - 1.89
Help on Optical Data: Optical Data: Biaxial (-), a=1.785, b=1.81, g=1.82, bire=0.0350, 2V(Calc)=62, 2V(Meas)=66. Dispersion r << v strong.
Help on Pleochroism (x): Pleochroism (x): light yellow.
Help on Pleochroism (y): Pleochroism (y): light yellow.
Help on Pleochroism (z): Pleochroism (z): dark orange brown.
 

Calculated Properties of Perraultite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.52 gm/cc
note: Specific Gravity of Perraultite =3.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEPerraultite = 60.38 barns/electron
U=PEPerraultite x relectron= 212.40 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 15.13 (Gamma Ray American Petroleum Institute Units)
Concentration of Perraultite per GRapi unit = 6.61 (%)

Estimated Radioactivity from Perraultite - barely detectable

 

Perraultite Classification

Help on  Dana Class: Dana Class: 78.01.05.02 (78)Unclassified silicates
  (78.01)possible nesosilicates
  (78.01.05)Jinshianghite group
 
78.01.05.01 Jinshajiangite Na2K5BaCa(Fe,Mn)8(Ti,Fe,Nb,Zr)4Si8O32(O,F,H2O)6 C 2/m,Cm,C 2 Mono
 
78.01.05.02 Perraultite (Na,Ca)2(Ba,K)2(Mn,Fe)8(Ti,Nb)4Si8O32(OH,F,O)6 C 2 2
Help on  Strunz Class: Strunz Class: 09.BE.67 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.67 Jinshajiangite Na2K5BaCa(Fe,Mn)8(Ti,Fe,Nb,Zr)4Si8O32(O,F,H2O)6 C 2/m,Cm,C 2 Mono
 
09.BE.67 Perraultite (Na,Ca)2(Ba,K)2(Mn,Fe)8(Ti,Nb)4Si8O32(OH,F,O)6 C 2 2
 
09.BE.67 Surkhobite KBa3Ca2Na2(Mn,Fe,Fe)16Ti8(Si2O7)8O8(OH)4(F,O,OH)8 C 2 2
 

Other Perraultite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.86) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Perraultite :
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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Perraultite

(Na,Ca)2(Ba,K)2(Mn++,Fe++)8(Ti,Nb)4Si8O32(OH,F,O)6
Dana No: 78.01.05.02 Strunz No: 09.BE.67
Locality:

 

Notes:

 

 
   
 


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