Mineralogy Database

Petedunnite Mineral Data

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General Petedunnite Information

Help on Chemical  Formula: Chemical Formula: Ca(Zn,Mn++,Fe++,Mg)Si2O6
Help on Composition: Composition: Molecular Weight = 246.86 gm
   Sodium      0.93 %  Na    1.26 % Na2O
   Calcium    14.61 %  Ca   20.44 % CaO
   Magnesium   0.98 %  Mg    1.63 % MgO
   Manganese   4.45 %  Mn    5.75 % MnO
   Zinc       10.60 %  Zn   13.19 % ZnO
   Iron        6.79 %  Fe    5.82 % FeO /  3.23 % Fe2O3
   Silicon    22.75 %  Si   48.68 % SiO2
   Oxygen     38.89 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.9Na0.1Zn0.4Fe2+0.2Mn2+0.2Mg0.1Fe3+0.1Si2O6
Help on Environment: Environment: In a metamorphosed, stratiform zinc deposit.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pete J. Dunn, Department of Mineral Sciences, Smithsonian Institution, Washington D. C., USA.
Help on Name Pronunciation: Name Pronunciation: Petedunnite + Pronunciation Say PETEDUNNITE
Help on Synonym: Synonym: ICSD 81450
  PDF 40-495

Petedunnite Image

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Comments: Dark green, fine-grained, massive petedunnite.
Location: Franklin, New Jersey, USA. Scale: See Image.
© Rruff Database

Petedunnite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0911:1:0.5855
Help on Cell Dimensions: Cell Dimensions: a = 9.82, b = 9, c = 5.27, Z = 4; beta = 105.6° V = 448.61 Den(Calc)= 3.65
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.02(1), 2.537(0.8), 2.96(0.4),

Physical Properties of Petedunnite

Help on Cleavage: Cleavage: {110} Good
Help on Color: Color: Dark green.
Help on Density: Density: 3.68
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: greenish white

Optical Properties of Petedunnite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.077 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.069 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.189,KPDmeas= 0.1875,KC= 0.2031
Ncalc = 1.74 - 1.75
Help on Optical Data: Optical Data: Biaxial (+), a=1.68, b=1.69, g=1.7, bire=0.0200, 2V(Calc)=88, 2V(Meas)=70-90.
Help on Pleochroism (x): Pleochroism (x): light yellow.
Help on Pleochroism (y): Pleochroism (y): light yellow.
Help on Pleochroism (z): Pleochroism (z): light green.

Calculated Properties of Petedunnite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.58 gm/cc
note: Specific Gravity of Petedunnite =3.65 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPetedunnite = 11.03 barns/electron
U=PEPetedunnite x rElectron Density= 39.51 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Petedunnite is Not Radioactive

Petedunnite Classification

Help on  Dana Class: Dana Class: 65.01.03a.05 (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.01)with chains P=2
  (65.01.03a)C2/c clinopyroxenes (Ca clinopyroxenes)
65.01.03a.01 Diopside CaMgSi2O6 C 2/c 2/m
65.01.03a.02 Hedenbergite CaFeSi2O6 C 2/c 2/m
65.01.03a.03 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m
65.01.03a.04 Johannsenite CaMnSi2O6 C 2/c 2/m
65.01.03a.05 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m
65.01.03a.06 Esseneite CaFeAlSiO6 C 2/c 2/m
65.01.03a.07 Davisite! Ca(Sc,Ti,Mg,Ti)AlSiO6 C 2/c 2/m
Help on  Strunz Class: Strunz Class: 09.DA.15 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
09.DA.15 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m
09.DA.15 Esseneite CaFeAlSiO6 C 2/c 2/m
09.DA.15 Diopside CaMgSi2O6 C 2/c 2/m
09.DA.15 Johannsenite CaMnSi2O6 C 2/c 2/m
09.DA.15 Hedenbergite CaFeSi2O6 C 2/c 2/m
09.DA.15 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m
09.DA.15 Davisite! Ca(Sc,Ti,Mg,Ti)AlSiO6 C 2/c 2/m

Other Petedunnite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Petedunnite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: 65.01.03a.05 Strunz No: 09.DA.15





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