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Donpeacorite

A valid IMA mineral species
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00651550014947083462444.jpg
Donpeacorite

Empire State No. 4 Mine, Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence County, New York, USA
00485060014947608709659.jpg
Donpeacorite

Empire State No. 4 Mine, Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence County, New York, USA
00337120014947608719873.jpg
Donpeacorite

Empire State No. 4 Mine, Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence County, New York, USA
02690670014947083458471.jpg
Donpeacorite

Empire State No. 4 Mine, Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence County, New York, USA
04088620014947083458677.jpg
Donpeacorite

Empire State No. 4 Mine, Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence County, New York, USA
09459750014947083459291.jpg
Donpeacorite

Empire State No. 4 Mine, Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence County, New York, USA
00651550014947083462444.jpg
Donpeacorite

Empire State No. 4 Mine, Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence County, New York, USA
00485060014947608709659.jpg
Donpeacorite

Empire State No. 4 Mine, Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence County, New York, USA
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About DonpeacoriteHide

05768440014958714709062.jpg
Donald R. Peacor
Formula:
(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
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.
Dimorph of:
Kanoite
This page provides mineralogical data about Donpeacorite.


Unique IdentifiersHide

Mindat ID:
1310
Long-form identifier:
mindat:1:1:1310:5
GUID
(UUID V4):
10d453a4-8325-41af-ba1a-6b13aba53a2d

IMA Classification of DonpeacoriteHide

Classification of DonpeacoriteHide

Strunz-mindat (2024):
9.DA.05

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 SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
DonIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of DonpeacoriteHide

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

Optical Data of DonpeacoriteHide

Type:
Biaxial (-)
RI values:
nα = 1.677 nβ = 1.684 nγ = 1.692
2V:
Measured: 88° , Calculated: 88°
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak

Chemistry of DonpeacoriteHide

Mindat Formula:
(Mn,Mg)MgSi2O6
Elements listed:
Mg, Mn, O, Si - search for minerals with similar chemistry
Common Impurities:
Al,Fe,Ca,Na

Chemical AnalysisHide

Oxide wt%:
 1
SiO255.02 %
TiO20.05 %
Al2O30.19 %
Mn2O3*1.06 %
Fe2O3*0.27 %
MnO*17.77 %
MgO26.40 %
CaO0.58 %
SrO0.01 %
Total:101.35 %
Empirical formulas:
Sample IDEmpirical Formula
1(Mn2+0.54Mg0.44Ca0.02)(Mg0.97Mn3+0.03)[Si1.98Al0.01Fe3+0.01O6]
Sample references:
IDLocalityReferenceNotes
1Empire State No. 4 Mine, Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence County, New York, USA
Frank K. Mazdab collection; sample FKM-122; https://www.rockptx.com/fkm-101-to-fkm-125/#FKM-122
Donpeacorite intergrown with clino-suenoite ("manganocummingtonite"), minor uvite, and rare scattered turneaureite. Analysis by EPMA. *Fe3+/∑Fe and Mn3+/∑Mn calculated by charge balance, with all Fe assigned to Fe3+ before any Mn is assigned to Mn3+. Site assignments are based only on the expected filling sequence and are not verified by structural evidence.

Crystallography of DonpeacoriteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
Cell Parameters:
a = 18.38 Å, b = 8.87 Å, c = 5.22 Å
Ratio:
a:b:c = 2.072 : 1 : 0.589
Unit Cell V:
851.02 ų (Calculated from Unit Cell)
Z:
8

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000937DonpeacoritePetersen E U, Anovitz L M, Essene E J (1984) Donpeacorite, (Mn,Mg)MgSi2O6, a new orthopyroxene and its proposed phase relations in the system MnSiO3-MgSiO3-FeSiO3 American Mineralogist 69 472-48019840293
0003667DonpeacoriteStimpfl M (2005) The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene American Mineralogist 90 155-16120050293
0003668DonpeacoriteStimpfl M (2005) The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene American Mineralogist 90 155-16120050293
0003669DonpeacoriteStimpfl M (2005) The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene American Mineralogist 90 155-16120050293
0003670DonpeacoriteStimpfl M (2005) The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene American Mineralogist 90 155-16120050293
0003671DonpeacoriteStimpfl M (2005) The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene American Mineralogist 90 155-16120050293
0003672DonpeacoriteStimpfl M (2005) The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene American Mineralogist 90 155-16120050293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.18 Å(100)
2.896 Å(60)
1.495 Å(11)
1.479 Å(11)
4.03 Å(10)
3.09 Å(10)
2.96 Å(10)
Comments:
Empire State Mine, New York, USA. Data from type description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 2: Planetesimal differentiation and alteration4.566-4.550
6 : Secondary asteroid phases4.566-4.560
High-𝑇 alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits
Stage 5: Initiation of plate tectonics<3.5-2.5
40 : Regional metamorphism (greenschist, amphibolite, granulite facies)

Type Occurrence of DonpeacoriteHide

Type Locality:
ⓘ Empire State No. 4 Mine, Balmat, Balmat-Edwards Zinc Mining District, St. Lawrence County, New York, USA
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:
TourmalineTourmalineTourmalineTiroditeHedyphane
Anhydrite
Reference:
Petersen, E.U., Anovitz, L.M., Essene, E.J. (1984) Donpeacorite, (Mn,Mg)MgSi2O6 a new orthopyroxene and its proposed phase relations in the system MnSiO3-MgSiO3-FeSiO3. American Mineralogist: 69: 472-480.

Other Language Names for DonpeacoriteHide

Relationship of Donpeacorite to other SpeciesHide

Member of:
Orthopyroxene Subgroup > Pyroxene Group
Other Members of this group:
EnstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbca
FerrosiliteFe2+2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbca
ProtoenstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbcn

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Donpeacorite associated with TurneaureiteCa5(AsO4)3Cl
4 photos of Donpeacorite associated with BrauniteMn2+Mn3+6(SiO4)O8
1 photo of Donpeacorite associated with Clino-suenoite◻{Mn2+2}{Mg5}(Si8O22)(OH)2

Related Minerals - Strunz-mindat GroupingHide

9.DA.ProtoenstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
9.DA.RyabchikoviteCuMgSi2O6Mon. 2/m : P21/b
9.DA.ColomeraiteNaTi3+Si2O6Mon. 2/m : B2/b
9.DA.05EnstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.05FerrosiliteFe2+2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.10ClinoenstatiteMgSiO3Mon. 2/m : P21/b
9.DA.10ClinoferrosiliteFe2+2Si2O6Mon. 2/m : P21/b
9.DA.10KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
9.DA.10Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : P21/b
9.DA.15Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : B2/b
9.DA.15DiopsideCaMgSi2O6Mon. 2/m : B2/b
9.DA.15EsseneiteCaFe3+[AlSiO6]Mon. 2/m : B2/b
9.DA.15HedenbergiteCaFe2+Si2O6Mon. 2/m : B2/b
9.DA.15 vaJeffersoniteCa(Mn,Zn,Fe)Si2O6
9.DA.15JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
9.DA.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon. 2/m : B2/b
9.DA.15DavisiteCaScAlSiO6Mon. 2/m : B2/b
9.DA.15KushiroiteCaAl[AlSiO6]Mon. 2/m : B2/b
9.DA.15GrossmaniteCaTi3+ AlSiO6Mon. 2/m : B2/b
9.DA.20Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m : B2/b
9.DA.20Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m
9.DA.25AegirineNaFe3+Si2O6Mon. 2/m : B2/b
9.DA.25JadeiteNa(Al,Fe3+)Si2O6Mon. 2/m : B2/b
9.DA.25JervisiteNaSc3+Si2O6Mon. 2/m : B2/b
9.DA.25KosmochlorNaCrSi2O6Mon. 2/m : B2/b
9.DA.25NamansiliteNaMn3+Si2O6Mon. 2/m : B2/b
9.DA.25NatalyiteNaV3+Si2O6Mon. 2/m : B2/b
9.DA.25Tissintite(Ca,Na,◻)AlSi2O6Mon. 2/m : B2/b
9.DA.30SpodumeneLiAlSi2O6Mon. 2/m : B2/b
9.DA.35HiroseiteFeSiO3Orth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

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

Internet Links for DonpeacoriteHide

References for DonpeacoriteHide

Localities for DonpeacoriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Japan
 
  • Hokkaidō Prefecture
    • Oshima Subprefecture
      • Futami District
        • Yakumo
          • Kumaishi
kensou.shinshu-u.ac.jp (n.d.)
Jordan
 
  • Mafraq Governorate
Yaseen (2014)
Mongolia
 
  • Ömnögovi Province
    • Khanbogd District
Davaasuren et al. (2016)
United Arab Emirates
 
  • Emirate of Fujairah
    • Semail Ophiolite
      • Khawr Fakkan Massif (Khor Fakkan)
        • Bani Hamid area
Mn-Mg-silicates from a manganiferous ... +1 other reference
USA (TL)
 
  • New York
    • St. Lawrence County
      • Balmat-Edwards Zinc Mining District
        • Balmat
Fleischer's Glossary of Mineral Species ... +2 other references
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