Pellyite Mineral Data

General Pellyite Information

Chemical Formula:

Ba2Ca(Fe++,Mg)2Si6O17

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

Empirical Formula:

Ba₂CaFe²⁺_1.2Mg_0.8Si₆O₁₇

Environment:

Contact metasomatic deposit.

IMA Status:

Approved IMA 1972

Locality:

Pelly and Ross River, Yukon Territories, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Pellyite

Synonym:

ICSD 12135

IMA1970-035

PDF 25-95

Pellyite Image

Images:

Pellyite Gillespite

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

Images:

Pellyite

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

Axial Ratios:

a:b:c =2.1922:1:1.9869

Cell Dimensions:

a = 15.677, b = 7.151, c = 14.209, Z = 4; V = 1,592.92 Den(Calc)= 3.51

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mcm

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

By Intensity(I/I_o): 3.43(1), 3.19(0.65), 2.308(0.6),

Crystal Structure:

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Meagher E P , American Mineralogist , 61 (1976) p.67-73, The atomic arrangement of pellyite: Ba2Ca(Fe,Mg)2Si6O17

Physical Properties of Pellyite

Cleavage:

{???} Indistinct, {???} Indistinct

Color:

Colorless, Light yellow.

Density:

3.51

Diaphaneity:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pellyite

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

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

Electron Density:

Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Pellyite =3.51 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Pellyite= 144.10 barns/electron
U=PE_Pellyite x rElectron Density= 472.09 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pellyite is Not Radioactive

Pellyite Classification

Dana Class:

78.06.03.01 (78)Unclassified silicates

(78.06)possible tectosilicates

(78.06.03)Dana Group

78.06.03.01 Pellyite Ba2Ca(Fe,Mg)2Si6O17 C mcm 2/m 2/m 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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
16 - WWW-MINCRYST

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Ask about Pellyite here :
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Print or Cut-and-Paste your Pellyite Specimen Label here :

Pellyite

Ba2Ca(Fe++,Mg)2Si6O17
Dana No: 78.06.03.01 Strunz No: 09.DO.10
Locality:

Notes: