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Pyroxferroite Mineral Data

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General Pyroxferroite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mn)7[Si7O21]
Help on Composition: Composition: Molecular Weight = 922.61 gm
   Manganese   5.95 %  Mn    7.69 % MnO
   Iron       36.32 %  Fe   46.72 % FeO
   Silicon    21.31 %  Si   45.59 % SiO2
   Oxygen     36.42 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+6Mn2+Si7O21
Help on Environment: Environment: Gabbroic rocks. Forms a series with pyroxmangite.
Help on IMA Status: IMA Status: Approved IMA 1970
Help on Locality: Locality: Sea of Tranquility, Moon and Isanago mine, Kyoto Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its resemblance to the pyroxenes and containing iron over manganese..
Help on Name Pronunciation: Name Pronunciation: Pyroxferroite + Pronunciation Say PYROXFERROITE
 

Pyroxferroite Image

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  Pyroxferroite

Comments: Brown crystalline pyroxferroite cleavage.
Location: Ohnari Mine, Mineyama-cho, Naka-Gun, Kyoto, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pyroxferroite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8769:1:2.298
Help on Cell Dimensions: Cell Dimensions: a = 6.632, b = 7.563, c = 17.38, Z = 1.2; alpha = 114.31°, beta = 82.75°, gamma = 94.58° V = 785.58 Den(Calc)= 2.34
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.934(1), 2.674(0.6), 3.09(0.45),
 

Physical Properties of Pyroxferroite

Help on Cleavage: Cleavage: {110} Perfect, {010} Poor, {001} Poor
Help on Color: Color: Colorless, Yellow, Orange, Pink orange.
Help on Density: Density: 3.68 - 3.76, Average = 3.72
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 4.5-5.5 - Near Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Pyroxferroite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.642 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3249,KPDmeas= 0.2035,KC= 0.1978
Ncalc = 1.46 - 1.74
Help on Optical Data: Optical Data: Biaxial (+), a=1.746-1.756, b=1.75-1.758, g=1.764-1.768, bire=0.0120-0.0180, 2V(Calc)=50-58, 2V(Meas)=30-40.
 

Calculated Properties of Pyroxferroite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.60 gm/cc
note: Specific Gravity of Pyroxferroite =3.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPyroxferroite = 13.24 barns/electron
U=PEPyroxferroite x rElectron Density= 47.72 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pyroxferroite is Not Radioactive
 

Pyroxferroite Classification

Help on  Dana Class: Dana Class: 65.06.01.02 (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.06)with chains P=7
  (65.06.01)Pyroxmangite group
 
65.06.01.01 Pyroxmangite (Mn,Fe)SiO3 P1 1
 
65.06.01.02 Pyroxferroite (Fe,Mn)7[Si7O21] P1 1
Help on  Strunz Class: Strunz Class: 09.DO.05 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.05 Pyroxmangite (Mn,Fe)SiO3 P1 1
 
09.DO.05 Pyroxferroite (Fe,Mn)7[Si7O21] P1 1
 

Other Pyroxferroite Information

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

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Pyroxferroite

(Fe++,Mn)7[Si7O21]
Dana No: 65.06.01.02 Strunz No: 09.DO.05
Locality:

 

Notes:

 

 
   
 


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