Pyroxmangite Mineral Data

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.

Name Pronunciation:

Pyroxmangite + Pronunciation

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

Diaphaneity:

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= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1961,KPDmeas= 0.1956,KC= 0.2011
Ncalc = 1.76

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:

Bulk Density (Electron Density)=3.65 gm/cc
note: Specific Gravity of Pyroxmangite =3.79 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Pyroxmangite= 11.99 barns/electron
U=PE_Pyroxmangite x rElectron Density= 43.78 barns/cc.

Radioactivity:

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

Pyroxmangite Classification

Dana Class:

65.06.01.01 (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

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 Pyroxmangite Information

References:

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

See Also:

Links to other databases for Pyroxmangite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineral and Gemstone Kingdom
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - University of Colorado - Mineral Structure Data
19 - WWW-MINCRYST

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

Pyroxmangite

(Mn,Fe++)SiO3
Dana No: 65.06.01.01 Strunz No: 09.DO.05
Locality:

Notes: