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Pyroxmangite

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Formula:
MnSiO3
System:
Triclinic
Colour:
Pink, red, brown
Hardness:
5½ - 6
Name:
Named in 1913 by William E. Ford and W. M. Bradley from PYROXene and MANGanese, in allusion to its structure and content of Manganese.
Dimorph of:
Pyroxferroite-Pyroxmangite Series.

Easily confused with rhodonite; however, pyroxmangite is a high-temperature environment mineral and syntheses have shown that pyroxmangite of MnSiO3 composition is the high-pressure, low-temperature polymorph with respect to rhodonite of the same composition (Maresch & Mottana, 1976).
Both may occur together (Sterling Mine, NJ, USA).

Note: "Type material" from Iva, South Carolina, USA, has been redefined as pyroxferroite, as it has Fe > Mn.


Visit gemdat.org for gemological information about Pyroxmangite.

Classification of Pyroxmangite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.DO.05

9 : SILICATES (Germanates)
D : Inosilicates
O : Inosilicates with 7-, 8-, 10-, 12- and 14-periodic chains
65.6.1.1

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
6 : Single-Width Unbranched Chains, W=1 with chains P=7
14.18.35

14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe
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Physical Properties of Pyroxmangite

Vitreous, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Pink, red, brown
Hardness (Mohs):
5½ - 6
Cleavage:
Perfect
On {110}, {11¯0}, (110) ^ (11¯0) = 92° perfect; on {010}, {001} poor.
Density:
3.61 - 3.8 g/cm3 (Measured)    3.75 g/cm3 (Calculated)

Crystallography of Pyroxmangite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Cell Parameters:
a = 9.69Å, b = 10.5Å, c = 17.39Å
α = 112.17°, β = 102.85°, γ = 82.93°
Ratio:
a:b:c = 0.923 : 1 : 1.656
Morphology:
Crystals commonly tabular on {001}; porphyroblastic; granular massive.
Twinning:
On {010} lamellar; on {001} simple, uncommon.

Optical Data of Pyroxmangite

Type:
Biaxial (+)
RI values:
nα = 1.726 - 1.748 nβ = 1.728 - 1.750 nγ = 1.744 - 1.764
2V:
Measured: 35° to 46°, Calculated: 40° to 42°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v moderate

Chemical Properties of Pyroxmangite

Formula:
MnSiO3
All elements listed in formula:
Common Impurities:
Al,Fe,Mg,Ca,Na,K,H2O

Relationship of Pyroxmangite to other Species

Series:
Forms a series with Pyroxferroite (see here)
9.DO.05Pyroxferroite(Fe,Mn,Ca)SiO3
9.DO.10PellyiteBa2Ca(Fe,Mg)2Si6O17
9.DO.15Nordite-(Ce)(Ce,La)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17
9.DO.15Nordite-(La)(La,Ce)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17
9.DO.15Ferronordite-(Ce)Na3SrCeFe2+Si6O17
9.DO.15Manganonordite-(Ce)Na3SrCeMn2+Si6O17
9.DO.15Ferronordite-(La)Na3Sr(La,Ce)FeSi6O17
9.DO.20AlamositePb12[Si12O36]
9.DO.25LiebauiteCa3Cu5Si9O26
14.18.1Nambulite(Li,Na)Mn4Si5O14(OH)
14.18.2Natronambulite(Na,Li)(Mn,Ca)4Si5O14OH
14.18.3ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2O
14.18.4NorrishiteKLiMn23+(Si4O10)O2
14.18.5Shafranovskite(Na,K)6(Mn,Fe)3Si9O24 · 6H2O
14.18.6AbswurmbachiteCuMn63+(SiO4)O8
14.18.7Donpeacorite(Mn2+,Mg)Mg[SiO3]2
14.18.8KanoiteMn2+(Mg,Mn2+)Si2O6
14.18.9Caryopilite(Mn,Mg)3(Si2O5)(OH)4
14.18.10Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
14.18.11Tirodite
14.18.12Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
14.18.13BustamiteCaMn2+(Si2O6)
14.18.14GlaucochroiteCaMn2+SiO4
14.18.15Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2O
14.18.16SantaclaraiteCaMn4[Si5O14OH](OH) · H2O
14.18.17FerrobustamiteCaFe2+(Si2O6)
14.18.18JohannseniteCaMn2+Si2O6
14.18.19NeltneriteCaMn63+(SiO4)O8
14.18.20OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2O
14.18.21InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2O
14.18.22OrientiteCa8Mn103+(SiO4)3(Si3O10)3(OH)10 · 4H2O
14.18.23RuiziteCa2Mn23+[(OH)2|H2Si4O13] · 2H2O
14.18.24BostwickiteCaMn6Si3O16 · 7H2O
14.18.25KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2O
14.18.26LithiomarsturiteLiCa2Mn2Si5O14(OH)
14.18.27SéranditeNa(Mn2+,Ca)2(HSi3O9)
14.18.28KvanefjelditeNa4(Ca,Mn)(Si3O7)2(OH)2
14.18.29MarsturiteNaCaMn3Si5O14(OH)
14.18.30RaiteNa4Mn32+Ti0.25Si8O20(OH)2 · 10H2O
14.18.31Richterite{Na}{CaNa}{Mg5}(Si8O22)(OH)2
14.18.32Byelorussite-(Ce)NaBa2Ce2MnTi2[Si4O12]2O2(F,OH) · H2O
14.18.33Deerite(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5
14.18.34Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3
14.18.36Dannemorite
14.18.37Neotocite(Mn,Fe,Mg)SiO3 · H2O
14.18.38BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
14.18.39ManganbabingtoniteCa2(Mn,Fe)FeSi5O14(OH)
14.18.40ÖrebroiteMn32+(Sb5+,Fe3+)(SiO4)(O,OH)3

Other Names for Pyroxmangite

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Pyroxmangite

Reference List:
Ford, W.E. and Bradley, W.M. (1913) Pyroxmangite, a new member of the pyroxene group and its alteration product, skemmatite. American Journal of Science: 36: 169-174 (now identified as pyroxferroite).

Ohashi, Y. and Finger, L.W. (1975) Pyroxenoids. A comparison of refined structures of rhodonite and pyroxmangite. Carnegie Institution Washington Year Book: 74: 564-569.

Maresch, W.V. and Mottana, A. (1976) The pyroxmangite-rhodonite transformation for the MnSiO3 composition. Contributions to Mineralogy and Petrology: 55: 69-79.

Narita, H., Koto, K., and Morimoto, N. (1977) The crystal structures of MnSiO3 polymorphs (rhodonite- and pyroxmangite-type). Mineralogical Journal of Sapporo: 8: 329-342.

Deer, W.A., Howie, R.A. & Zussman, J. (1978) Rock-forming Minerals, 2nd. Edition: 2A: 600-613.

American Mineralogist (1988): 73: 798-808.

Nikischer, Tony and Joe Orosz (2007) Lunar Mineral Found at Franklin, Sussex Co., New Jersey. Mineral News: 23(8): 1, 2, 9, 14.

Internet Links for Pyroxmangite

Specimens:
The following Pyroxmangite specimens are currently listed for sale on minfind.com.

Localities for Pyroxmangite

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