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Petedunnite

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Buckwheat Pit (Southwest Opening; Buckwheat Mine), Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
© Knut Eldjarn

Show Petedunnite Photos (2)
Formula:
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
System:MonoclinicColour:dark green
Hardness:5 - 6
Name:Named after Dr. Pete J. Dunn, Mineralogist 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.


Pyroxene Group - Clinopyroxene Subgroup; see also the Hedenbergite-Petedunnite solid solution.

Classification of Petedunnite

IMA status:Approved 1983
Strunz 8th edition ID:8/F.01-80
Nickel-Strunz 10th (pending) edition ID:9.DA.15

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
Dana 8th edition ID:65.1.3a.5

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Hey's CIM Ref.:14.7.15

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

Type Locality:Buckwheat Pit (Southwest Opening; Buckwheat Mine), Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Year of Discovery:1987

Physical Properties of Petedunnite

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

Crystallography of Petedunnite

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

Optical Data of Petedunnite

Type:Biaxial (+)
RI values: nα = 1.680 nβ = 1.690 nγ = 1.700
2V:Measured: 70° to 90°, Calculated: 88°
Maximum Birefringence:δ = 0.020

Chart 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 Petedunnite

Formula:
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
Essential elements:Ca, O, Si, Zn
All elements listed in formula:Ca, Fe, Mg, Mn, O, Si, Zn
Common Impurities:Al,Fe,Na

Relationship of Petedunnite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.DA.05Donpeacorite
(Mn
2+
 
,Mg)Mg[SiO
 
3
]
 
2
9.DA.05Enstatite
Mg
 
2
[SiO
 
3
]
 
2
9.DA.05Ferrosilite
Fe
 
2
[SiO
 
3
]
 
2
9.DA.05Akimotoite
(Mg,Fe
2+
 
)SiO
 
3
9.DA.10Clinoenstatite
Mg
 
2
[Si
 
2
O
 
6
]
9.DA.10Clinoferrosilite
Fe
2+
 
(Fe
2+
 
,Mg)[Si
 
2
O
 
6
]
9.DA.10Kanoite
Mn
2+
 
(Mg,Mn
2+
 
)[Si
 
2
O
 
6
]
9.DA.10Pigeonite
(Mg,Fe
2+
 
,Ca)(Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.15Augite
(Ca,Na)(Mg,Fe
2+
 
,Al,Fe
3+
 
,Ti)[(Si,Al)
 
2
O
 
6
]
9.DA.15Diopside
CaMg[Si
 
2
O
 
6
]
9.DA.15Esseneite
CaFe
3+
 
[AlSiO
 
6
]
9.DA.15Hedenbergite
CaFe
2+
 
[Si
 
2
O
 
6
]
9.DA.15Johannsenite
CaMn
2+
 
[Si
 
2
O
 
6
]
9.DA.20Aegirine-augite
(Na,Ca)(Fe,Fe,Mg,Al)Si
 
2
O
 
6
9.DA.20Omphacite
(Ca,Na)(Mg,Al)[Si
 
2
O
 
6
]
9.DA.25Aegirine
NaFe
3+
 
[Si
 
2
O
 
6
]
9.DA.25Jadeite
Na(Al,Fe
3+
 
)[Si
 
2
O
 
6
]
9.DA.25Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.25Kosmochlor
NaCr[Si
 
2
O
 
6
]
9.DA.25Namansilite
NaMn
3+
 
[Si
 
2
O
 
6
]
9.DA.25Natalyite
Na(V
3+
 
,Cr)[Si
 
2
O
 
6
]
9.DA.30Spodumene
LiAl[Si
 
2
O
 
6
]
Related Minerals - Hey's Index Grouping:
14.7.1Sanbornite
Ba
 
2
[Si
 
4
O
 
10
]
14.7.2Krauskopfite
BaSi
 
2
O
 
5
·3H
 
2
O
14.7.3Walstromite
BaCa
 
2
[Si
 
3
O
 
9
]
14.7.4Macdonaldite
BaCa
 
4
Si
 
16
O
 
36
(OH)
 
2
·10H
 
2
O
14.7.5Ericssonite
BaMn
2+
2
Fe
3+
 
[O|OH|Si
 
2
O
 
7
]
14.7.6Orthoericssonite
BaMn
2+
2
Fe
3+
 
[O|OH|Si
 
2
O
 
7
]
14.7.7Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
14.7.8Andrémeyerite
BaFe
2+
2
[Si
 
2
O
 
7
]
14.7.9Pellyite
Ba
 
2
Ca(Fe,Mg)
 
2
Si
 
6
O
 
17
14.7.10Taikanite
Sr
 
3
BaMn
2+
2
[O|Si
 
2
O
 
6
]
 
2
14.7.11Willemite
Zn
 
2
[SiO
 
4
]
14.7.12Hemimorphite
Zn
 
4
[(OH)
 
2
|Si
 
2
O
 
7
] · H
 
2
O
14.7.13Zincsilite
Zn
 
3
Si
 
4
O
 
10
(OH)
 
2
·4H
 
2
O
14.7.14Hardystonite
Ca
 
2
Zn[Si
 
2
O
 
7
]
14.7.16Clinohedrite
CaZn[SiO
 
4
] · H
 
2
O
14.7.17Junitoite
CaZn
 
2
[Si
 
2
O
 
7
] · H
 
2
O
14.7.18Larsenite
PbZn[SiO
 
4
]
14.7.19Esperite
PbCa
 
3
Zn
 
4
[SiO
 
4
]
 
4
14.7.20Hodgkinsonite
Mn
2+
 
Zn
 
2
[(OH)
 
2
|SiO
 
4
]
14.7.21Gerstmannite
(Mg,Mn
2+
 
)Zn[(OH)
 
2
|SiO
 
4
]
14.7.22Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
14.7.23Franklinfurnaceite
Ca
 
2
FeMn
 
3
MnZn
 
2
Si
 
2
O
 
10
(OH)
 
8

Other Names for Petedunnite

Synonyms:
IMA1983-073
German names:
Petedunnit
Spanish names:
Petedunnita

Other Information

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

References for Petedunnite

Reference List: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.

Fehr, K.T. and 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. and 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 Petedunnite

Search Engines:
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    • External Links:
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  • Look for Petedunnite on Wikipedia
  • Look for Petedunnite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Petedunnite in the Natural History Museum (London) online catalogue
  • Petedunnite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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  • Rare and Unusual minerals at Mineralogical Research Company
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  • Search for Petedunnite on minvision.com
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    Localities for Petedunnite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Franklin
    		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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