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Petedunnite

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Pete Dunn
Formula:
Ca(Zn,Mn2+,Mg,Fe2+)Si2O6
Colour:
dark green
Hardness:
5 - 6
Crystal System:
Monoclinic
Name:
Named in 1987 by Eric J. Essene and Donald Ralph Peacor in honor of Pete J. Dunn [b. November 10, 1942 USA, d. November 10 2017 USA], Museum Specialist, Department of Mineral Sciences, Smithsonian Institution, Washington, D.C., who studied and made major contributions to the mineralogy of the Franklin, New Jersey Mining District.
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Classification of PetedunniteHide

Approved
Approval Year:
1983
9.DA.15

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
65.1.3a.5

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
14.7.15

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn

Physical Properties of PetedunniteHide

Colour:
dark green
Streak:
greenish white
Hardness:
5 - 6 on Mohs scale
Cleavage:
Distinct/Good

Optical Data of PetedunniteHide

Type:
Biaxial (+)
RI values:
nα = 1.680 nβ = 1.690 nγ = 1.700
2V:
Measured: 70° to 90°, Calculated: 88°
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v strong

Chemical Properties of PetedunniteHide

Formula:
Ca(Zn,Mn2+,Mg,Fe2+)Si2O6
IMA Formula:
CaZnSi2O6
Common Impurities:
Al,Fe,Na

Crystallography of PetedunniteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 9.82 Å, b = 9 Å, c = 5.27 Å
β = 105.62°
Ratio:
a:b:c = 1.091 : 1 : 0.586
Unit Cell V:
448.56 ų (Calculated from Unit Cell)

Type Occurrence of PetedunniteHide

Synonyms of PetedunniteHide

Other Language Names for PetedunniteHide

German:Petedunnit
Spanish:Petedunnita

Relationship of Petedunnite to other SpeciesHide

Other Members of this group:
AegirineNaFe3+Si2O6Mon. 2/m : B2/b
Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m : B2/b
Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : B2/b
ClinoenstatiteMgSiO3Mon. 2/m : P21/b
ClinoferrosiliteFe2+SiO3Mon. 2/m : P21/b
DiopsideCaMgSi2O6Mon. 2/m : B2/b
EsseneiteCaFe3+[AlSiO6]Mon. 2/m : B2/b
HedenbergiteCaFe2+Si2O6Mon. 2/m : B2/b
JadeiteNa(Al,Fe3+)Si2O6Mon.
JervisiteNaSc3+Si2O6Mon.
JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
KosmochlorNaCrSi2O6Mon.
KushiroiteCaAl[AlSiO6]Mon. 2/m : B2/b
NamansiliteNaMn3+Si2O6Mon.
NatalyiteNaV3+Si2O6Mon.
Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m
Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : P21/b
SpodumeneLiAlSi2O6Mon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Willemite2 photos of Petedunnite associated with Willemite on mindat.org.
Hedenbergite1 photo of Petedunnite associated with Hedenbergite on mindat.org.
Albite1 photo of Petedunnite associated with Albite on mindat.org.
Calcite1 photo of Petedunnite associated with Calcite on mindat.org.
Fluorapatite1 photo of Petedunnite associated with Fluorapatite on mindat.org.
Quartz1 photo of Petedunnite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DA.05Donpeacorite(Mn2+,Mg)Mg[SiO3]2Orth.
9.DA.05EnstatiteMgSiO3Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.05FerrosiliteFeSiO3Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.10ClinoenstatiteMgSiO3Mon. 2/m : P21/b
9.DA.10ClinoferrosiliteFe2+SiO3Mon. 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.15JohannseniteCaMn2+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.
9.DA.25JervisiteNaSc3+Si2O6Mon.
9.DA.25KosmochlorNaCrSi2O6Mon.
9.DA.25NamansiliteNaMn3+Si2O6Mon.
9.DA.25NatalyiteNaV3+Si2O6Mon.
9.DA.30SpodumeneLiAlSi2O6Mon.

Related Minerals - Dana Grouping (8th Ed.)Hide

65.1.3a.1DiopsideCaMgSi2O6Mon. 2/m : B2/b
65.1.3a.2HedenbergiteCaFe2+Si2O6Mon. 2/m : B2/b
65.1.3a.3Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : B2/b
65.1.3a.4JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
65.1.3a.6EsseneiteCaFe3+[AlSiO6]Mon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.7.1SanborniteBa2(Si4O10)Orth.
14.7.2KrauskopfiteBaSi2O5 · 3H2OMon.
14.7.3WalstromiteBaCa2(Si3O9)Tric.
14.7.4MacdonalditeBaCa4Si16O36(OH)2 · 10H2OOrth.
14.7.5EricssoniteBaMn2+2Fe3+(Si2O7)O(OH)Mon. 2/m : B2/m
14.7.6Ericssonite-2OBaMn2+2Fe3+(Si2O7)O(OH)Orth.
14.7.7GillespiteBaFe2+Si4O10Tet.
14.7.8AndrémeyeriteBaFe2+2(Si2O7)Mon.
14.7.9PellyiteBa2Ca(Fe,Mg)2Si6O17Orth.
14.7.10TaikaniteSr3BaMn2+2(Si4O12)O2Mon.
14.7.11WillemiteZn2SiO4Trig. 3 : R3
14.7.12HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
14.7.13ZincsiliteZn3(Si4O10)(OH)2 · 4H2OMon.
14.7.14HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
14.7.16ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
14.7.17JunitoiteCaZn2Si2O7 · H2OOrth. mm2
14.7.18LarsenitePbZnSiO4Orth. mm2 : Pna21
14.7.19EsperitePbCa2Zn3(SiO4)3Mon. 2/m : P21/m
14.7.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2Mon.
14.7.21GerstmanniteMnMgZn(SiO4)(OH)2Orth.
14.7.22GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
14.7.23FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8Mon. 2 : B2

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.

References for PetedunniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Essene, E.J., Peacor, D.R. (1987) Petedunnite (CaZnSi2O6), a new zinc clinopyroxene from Franklin, New Jersey, and phase equilibria for zincian pyroxenes. American Mineralogist: 72: 157-166.
Fehr, K.T., Hobelsberger, B. (1997) Experimentelle Bestimmung der chemischen Potentiale von Hedenbergit in der Mischreihe Hedenbergit-Petedunnit. Beiheft zum European Journal of Mineralogy: 9: 98.
Rothkopf, A.L., Fehr, K.T. (1998) The chemical potential of hedenbergite in hedenbergite-peetedunnite solid solution determined by EMF measurements. Terra Abstracts: 10: Supplement 1: 53.

Internet Links for PetedunniteHide

Localities for PetedunniteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Nicaragua
 
  • León Department
Hynek, B. M., McCollom, T. M., Marcucci, E. C., Brugman, K., & Rogers, K. L. (2013). Assessment of environmental controls on acid‐sulfate alteration at active volcanoes in Nicaragua: Applications to relic hydrothermal systems on Mars. Journal of Geophysical Research: Planets, 118(10), 2083-2104.
USA
 
  • Arkansas
    • Hot Spring Co.
Rocks and Minerals, (2001) 76:257
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
          • Franklin Mine
Dunn (1995)
Essene, E.J. and Peacor, D.R. (1987) Petedunnite (CaZnSi2O6), a new zinc clinopyroxene from Franklin, New Jersey, and phase equilibria for zincian pyroxenes. American Mineralogist (1987): 72: 157-166; Dunn, Pete J. (1995): Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits, Part 3: 436.
Mineral and/or Locality  
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