Mineralogy Database

Pellyite Mineral Data

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General Pellyite Information

Help on Chemical  Formula: Chemical Formula: Ba2Ca(Fe++,Mg)2Si6O17
Help on Composition: Composition: Molecular Weight = 841.70 gm
   Barium     32.63 %  Ba   36.43 % BaO
   Calcium     4.76 %  Ca    6.66 % CaO
   Magnesium   2.31 %  Mg    3.83 % MgO
   Iron        7.96 %  Fe   10.24 % FeO
   Silicon    20.02 %  Si   42.83 % SiO2
   Oxygen     32.31 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba2CaFe2+1.2Mg0.8Si6O17
Help on Environment: Environment: Contact metasomatic deposit.
Help on IMA Status: IMA Status: Approved IMA 1972
Help on Locality: Locality: Pelly and Ross River, Yukon Territories, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Pellyite Say PELLYITE
Help on Synonym: Synonym: ICSD 12135
  PDF 25-95

Pellyite Image

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  Gillespite   Pellyite

Comments: Red crystalline gillespite with yellow pellyite rock matrix.
Location: GUN claims, Itsi Mountains, MacMillan Pass Area, Yukon Territory, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Brown massive pellyite in barite.
Location: Rush Creek, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pellyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.1922:1:1.9869
Help on Cell Dimensions: Cell Dimensions: a = 15.677, b = 7.151, c = 14.209, Z = 4; V = 1,592.92 Den(Calc)= 3.51
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mcm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.43(1), 3.19(0.65), 2.308(0.6),

Physical Properties of Pellyite

Help on Cleavage: Cleavage: {???} Indistinct, {???} Indistinct
Help on Color: Color: Colorless, Light yellow.
Help on Density: Density: 3.51
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Pellyite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.041 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.184,KPDmeas= 0.184,KC= 0.1766
Ncalc = 1.62
Help on Optical Data: Optical Data: Biaxial (+), a=1.643, b=1.645, g=1.649, bire=0.0060, 2V(Calc)=72, 2V(Meas)=47. Dispersion very strong, r > v.

Calculated Properties of Pellyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Pellyite =3.51 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEPellyite = 144.10 barns/electron
U=PEPellyite x rElectron Density= 472.09 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pellyite is Not Radioactive

Pellyite Classification

Help on  Dana Class: Dana Class: (78)Unclassified silicates
  (78.06)possible tectosilicates
  (78.06.03)Dana Group Pellyite Ba2Ca(Fe,Mg)2Si6O17 C mcm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DO.10 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DO -Inosilicates with 7-, 8-, 10-, 12- and 14-periodic chains
09.DO.10 Pellyite Ba2Ca(Fe,Mg)2Si6O17 C mcm 2/m 2/m 2/m

Other Pellyite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Pellyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - CalTech Mineral Spectroscopy
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 09.DO.10





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