Pyroxmangite Mineral Data

Pyroxmangite Mineral Data +

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General Pyroxmangite Information

Chemical Formula:

(Mn,Fe++)SiO3

Composition:

Molecular Weight = 131.20 gm

Manganese 33.50 % Mn 43.25 % MnO

Iron 8.51 % Fe 10.95 % FeO

Silicon 21.41 % Si 45.79 % SiO₂

Oxygen 36.58 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.8Fe²⁺_0.2SiO₃

Environment:

Metamorphic and contact metasomatism of Mn-bearing rocks. Forms a series with pyroxferroite

IMA Status:

Valid Species (Pre-IMA) 1913

Locality:

Tunaberg, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named after its resemblance to the pyroxenes and containing manganese.

Synonym:

ICSD 34159

PDF 29-895

Pyroxmangite Image

Images:

Pyroxmangite

Comments: Pinkish red nearly opaque crystalline pyroxmangite.
Location: Shidara, Kitashidara-Gun, Aichi, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pyroxmangite Crystallography

Axial Ratios:

a:b:c =0.8886:1:2.298

Cell Dimensions:

a = 6.721, b = 7.563, c = 17.38, Z = 14; alpha = 113.17°, beta = 82.27°, gamma = 94.13° V = 802.71 Den(Calc)= 3.80

Crystal System:

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

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

By Intensity(I/I_o): 2.95(1), 2.18(0.7), 3.12(0.6),

Crystal Structure:

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Pinckney L R , Burnham C W , American Mineralogist , 73 (1988) p.809-817, High-temperature crystal structure of pyroxmangite, Sample: T = 24 C

View Additional jPOWD Structure files for Pyroxmangite
[1] [2] [3]

Physical Properties of Pyroxmangite

Cleavage:

[110] Perfect, [110] Perfect

Color:

Pink, Rose pink, Purplish pink, Yellowish red brown, Brown.

Density:

3.8

Diaphaniety:

Transparent to translucent

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Magnetism:

Magnetic after heating

Streak:

white

Optical Properties of Pyroxmangite

Gladstone-Dale:

CI meas= 0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1956,KPDmeas= 0.1956,KC= 0.2011

Optical Data:

Biaxial (+), a=1.726-1.748, b=1.728-1.75, g=1.744-1.764, bire=0.0160-0.0180, 2V(Calc)=40-42, 2V(Meas)=35-46. Dispersion r > v moderate.

Calculated Properties of Pyroxmangite

Electron Density:

r_electron=3.66 gm/cc
note: r_Pyroxmangite=3.80 gm/cc.

Fermion Index

Fermion Index = 0.01197
Boson Index = 0.98803

Photoelectric:

PE_Pyroxmangite= 11.99 barns/electron
U=PE_Pyroxmangite x r_electron= 43.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pyroxmangite is Not Radioactive

Pyroxmangite Classification

Dana Class:

65.6.1.1 (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.31-20 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 Pyroxmangite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Pyroxmangite Specimen Label here :

Pyroxmangite

(Mn,Fe++)SiO3
Dana No: 65.6.1.1 Strunz No: VIII/F.31-20
Locality:

Notes: