General Petedunnite Information Chemical Formula: |
Ca(Zn,Mn++,Fe++,Mg)Si2O6 |
Composition: |
Molecular Weight = 246.86 gm |
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Sodium 0.93 % Na 1.26 % Na2O |
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Calcium 14.61 % Ca 20.44 % CaO |
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Magnesium 0.98 % Mg 1.63 % MgO |
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Manganese 4.45 % Mn 5.75 % MnO |
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Zinc 10.60 % Zn 13.19 % ZnO |
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Iron 6.79 % Fe 5.82 % FeO / 3.23 % Fe2O3 |
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Silicon 22.75 % Si 48.68 % SiO2 |
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Oxygen 38.89 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Ca0.9Na0.1Zn0.4Fe2+0.2Mn2+0.2Mg0.1Fe3+0.1Si2O6 |
Environment: |
In a metamorphosed, stratiform zinc deposit. |
IMA Status: |
Approved IMA 1987 |
Locality: |
Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data. |
Name Origin: |
Named for Pete J. Dunn, Department of Mineral Sciences, Smithsonian Institution, Washington D. C., USA. |
Name Pronunciation: |
Petedunnite + Pronunciation |
Synonym: |
ICSD 81450 |
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PDF 40-495 |
| | Petedunnite Image
Images:
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Petedunnite Crystallography Axial Ratios: |
a:b:c =1.0911:1:0.5855 |
Cell Dimensions: |
a = 9.82, b = 9, c = 5.27, Z = 4; beta = 105.6° V = 448.61 Den(Calc)= 3.65 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c |
X Ray Diffraction: |
By Intensity(I/Io): 3.02(1), 2.537(0.8), 2.96(0.4), |
Crystal Structure:
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Mouse
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| Physical Properties of Petedunnite Cleavage: |
{110} Good |
Color: |
Dark green. |
Density: |
3.68 |
Diaphaneity: |
Translucent |
Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
Hardness: |
6 - Orthoclase |
Luster: |
Vitreous (Glassy) |
Streak: |
greenish white |
| Optical Properties of Petedunnite 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 Optical Data: |
Biaxial (+), a=1.68, b=1.69, g=1.7, bire=0.0200, 2V(Calc)=88, 2V(Meas)=70-90. |
Pleochroism (x): |
light yellow. |
Pleochroism (y): |
light yellow. |
Pleochroism (z): |
light green. |
| Calculated Properties of Petedunnite Electron Density: |
Bulk Density (Electron Density)=3.58 gm/cc |
note: Specific Gravity of Petedunnite =3.65 gm/cc. Fermion Index: |
Fermion Index = 0.01 |
Boson Index = 0.99 Photoelectric: |
PEPetedunnite = 11.03 barns/electron |
U=PEPetedunnite x rElectron Density= 39.51 barns/cc. Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Petedunnite is Not Radioactive | Petedunnite Classification Dana Class: |
65.01.03a.05 (65)Inosilicate Single-Width Unbranched Chains, W=1 |
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(65.01)with chains P=2 |
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(65.01.03a)C2/c clinopyroxenes (Ca clinopyroxenes) |
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Strunz Class: |
09.DA.15 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family |
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| Other Petedunnite Information References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2) |
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 Search for Petedunnite using: Visit our Advertisers for Petedunnite : A Bijoux Google Search for PetedunniteAdam's Minerals Google Search for Petedunnite Cape Minerals Google Search for Petedunnite Dakota Matrix Minerals Google Search for Petedunnite Excalibur Mineral Corp. Google Search for Petedunnite Exceptional Minerals Google Search for Petedunnite John Betts Fine Minerals Search for Petedunnite McDougall Minerals Google Search for Petedunnite Mineral News Website Link Rock and Mineral Shows Google Search for Petedunnite Weinrich Minerals, Inc. Google Search for Petedunnite Ask about Petedunnite here : Print or Cut-and-Paste your Petedunnite Specimen Label here :
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