Pyroxferroite Mineral Data

Pyroxferroite Mineral Data +

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General Pyroxferroite Information

Chemical Formula:

(Fe++,Mn)7[Si7O21]

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

Empirical Formula:

Fe²⁺₆Mn²⁺Si₇O₂₁

Environment:

Gabbroic rocks. Forms a series with pyroxmangite.

IMA Status:

Approved IMA 1970

Locality:

Sea of Tranquility, Moon and Isanago mine, Kyoto Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named after its resemblance to the pyroxenes and containing iron over manganese..

Pyroxferroite Image

Images:

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

Axial Ratios:

a:b:c =0.8769:1:2.298

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

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.934(1), 2.674(0.6), 3.09(0.45),

Physical Properties of Pyroxferroite

Cleavage:

[110] Perfect, [010] Poor, [001] Poor

Color:

Colorless, Yellow, Orange, Pink orange.

Density:

3.68 - 3.76, Average = 3.72

Diaphaniety:

Transparent to Translucent

Hardness:

4.5-5.5 - Near Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pyroxferroite

Gladstone-Dale:

CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.635 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3235,KPDmeas= 0.2035,KC= 0.1978

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

Electron Density:

r_electron=3.60 gm/cc
note: r_{Pyroxferroite}=3.72 gm/cc.

Fermion Index

Fermion Index = 0.01782
Boson Index = 0.98218

Photoelectric:

PE_{Pyroxferroite}= 13.24 barns/electron
U=PE_{Pyroxferroite} x r_electron= 47.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pyroxferroite is Not Radioactive

Pyroxferroite Classification

Dana Class:

65.6.1.2 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.6)with chains P=7

(65.6.1)Pyroxmangite group

65.6.1.1 Pyroxmangite (Mn,Fe)SiO3 P1 1

65.6.1.2 Pyroxferroite (Fe,Mn)7[Si7O21] P1 1

Strunz Class:

VIII/F.31-10 VIII - Silicates

VIII/F - Inosilicates (chain and band) Seven bands [Si7O21]14-

VIII/F.31 - Pyroxferroite - Plumalsite series

VIII/F.31-10 Pyroxferroite (Fe,Mn)7[Si7O21] P1 1

VIII/F.31-20 Pyroxmangite (Mn,Fe)SiO3 P1 1

VIII/F.31-30 Plumalsite? Pb4Al2(SiO3)7(?) Unk Ortho

Other Pyroxferroite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Pyroxferroite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Pyroxferroite

(Fe++,Mn)7[Si7O21]
Dana No: 65.6.1.2 Strunz No: VIII/F.31-10
Locality:

Notes: