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Donpeacorite

A valid IMA mineral species
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(Mn,Mg)MgSi2O6
Colour:
Pale buff, yellow-orange; faint pink in thin section.
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
3.36
Crystal System:
Orthorhombic
Member of:
Orthopyroxene Subgroup >Pyroxene Group
Name:
Named in 1984 by Erich U. Petersen, Lawrence M. Anovitz, and Eric J. Essene in honor of Donald Ralph Peacor [b. 1937 Somerville, Massachusetts, USA], mineralogist at the University of Michigan, in recognition of his work on pyroxenes and manganese minerals. He authored/coauthored descriptions of approximately 90 new minerals and worked on the structure of many others.
Type Locality:
ⓘEmpire State No. 4 Mine, Balmat, Fowler, St. Lawrence County, New York, USA
Dimorph of:
Kanoite
This page provides mineralogical data about Donpeacorite.


Unique Identifiers
First published:
1984
Type description reference:
Peterson, Erich U., Anovitz, Lawrence M., Essene, Eric J. (1984) Donpeacorite, (Mn,Mg)MgSi2O6, a new orthopyroxene and its proposed phase relations in the system MnSiO3-MgSiO3-FeSiO3.American Mineralogist, 69 (5-6). 472-480

Classification of Donpeacorite

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
Dana 8th ed.:
65.1.2.3

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Hey's CIM Ref.:
14.18.7

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

Mineral Symbols
Transparency:
Translucent
Colour:
Pale buff, yellow-orange; faint pink in thin section.
Hardness:
5 - 6 onMohs scale
Cleavage:
Perfect
{110}
Density:
3.36(1) g/cm3 (Measured)    3.403(2) g/cm3 (Calculated)

Optical Data of Donpeacorite
Surface Relief:
Moderate
Dispersion:
weak

Chemistry of Donpeacorite
Common Impurities:
Al,Fe,Ca,Na

Chemical Analysis

Crystallography of Donpeacorite
General Appearance of Type Material:
Interlocking grains up to 3 mm.
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, 124237; National Museum of Natural History, Washington, D.C., USA, 159862.
Geological Setting of Type Material:
manganese-rich siliceous marbles metamorphosed to the upper amphibolite facies
Associated Minerals at Type Locality:
AnhydriteHedyphaneTiroditeTourmaline
Reference:
Peterson, Erich U., Anovitz, Lawrence M., Essene, Eric J. (1984) Donpeacorite, (Mn,Mg)MgSi2O6, a new orthopyroxene and its proposed phase relations in the system MnSiO3-MgSiO3-FeSiO3.American Mineralogist, 69 (5-6). 472-480

Other Language Names for Donpeacorite

Relationship of Donpeacorite to other Species
Other Members of Orthopyroxene Subgroup:
EnstatiteMg2Si2O6Orth.mmm(2/m2/m2/m) :Pbca
FerrosiliteFe2+2Si2O6Orth.mmm(2/m2/m2/m) :Pbca
ProtoenstatiteMg2Si2O6Orth.mmm(2/m2/m2/m) :Pbcn

Common AssociatesMon. 2/m :B2/b9.DA.ProtoenstatiteMg2Si2O6Orth.mmm(2/m2/m2/m) :Pbcn9.DA.RyabchikoviteCuMgSi2O6Mon. 2/m :P21/b9.DA.05EnstatiteMg2Si2O6Orth.mmm(2/m2/m2/m) :Pbca9.DA.05FerrosiliteFe2+2Si2O6Orth.mmm(2/m2/m2/m) :Pbca9.DA.10ClinoenstatiteMgSiO3Mon. 2/m :P21/b9.DA.10ClinoferrosiliteFe2+2Si2O6Mon. 2/m :P21/b9.DA.10KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m :P21/b9.DA.10Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m :P21/b9.DA.15GrossmaniteCaTi3+ AlSiO6Mon. 2/m :B2/b9.DA.15DiopsideCaMgSi2O6Mon. 2/m :B2/b9.DA.15 vaJeffersoniteCa(Mn,Zn,Fe)Si2O69.DA.15HedenbergiteCaFe2+Si2O6Mon. 2/m :B2/b9.DA.15JohannseniteCaMn2+Si2O6Mon. 2/m :B2/b9.DA.15PetedunniteCaZnSi2O6Mon. 2/m :B2/b9.DA.15EsseneiteCaFe3+[AlSiO6]Mon. 2/m :B2/b9.DA.15KushiroiteCaAlAlSiO6Mon. 2/m :B2/b9.DA.15Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m :B2/b9.DA.15DavisiteCaScAlSiO6Mon. 2/m :B2/b9.DA.20Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m :B2/b9.DA.20Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m9.DA.25JadeiteNa(Al,Fe3+)Si2O6Mon. 2/m :B2/b9.DA.25NamansiliteNaMn3+Si2O6Mon. 2/m :B2/b9.DA.25NatalyiteNaV3+Si2O6Mon. 2/m :B2/b9.DA.25AegirineNaFe3+Si2O6Mon. 2/m :B2/b9.DA.25JervisiteNaSc3+Si2O6Mon. 2/m :B2/b9.DA.25Tissintite(Ca,◻)AlSi2O6Mon. 2/m :B2/b9.DA.25KosmochlorNaCrSi2O6Mon. 2/m :B2/b9.DA.30SpodumeneLiAlSi2O6Mon. 2/m :B2/b9.DA.35HiroseiteFeSiO3Orth.mmm(2/m2/m2/m) :Pnma

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    • References for DonpeacoriteⓘTatehira minekensou.shinshu-u.ac.jp (n.d.)
    Jordan
     
    Yaseen (2014)
    Mongolia
     
    Davaasuren et al. (2016)
    United Arab Emirates
     
    Gnos et al. (1996)+1 other reference
    USA (TL)
     
    Fleischer's Glossary of Mineral Species ...+2 other references
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