Petedunnite Mineral Data

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General Petedunnite Information

Chemical Formula:

Ca(Zn,Mn++,Fe++,Mg)Si2O6

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

Empirical Formula:

Ca_0.9Na_0.1Zn_0.4Fe²⁺_0.2Mn²⁺_0.2Mg_0.1Fe³⁺_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

PDF 40-495

Petedunnite Image

Images:

Petedunnite

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

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.02(1), 2.537(0.8), 2.96(0.4),

Crystal Structure:

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Redhammer G J , Roth G , Acta Crystallographica, Section C , 61 (2005) p.i20-i22, A comparison of the clinopyroxene compounds CaZnSi2O6 and CaZnGe2O6, Locality: synthetic

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:

PE_Petedunnite= 11.03 barns/electron
U=PE_Petedunnite 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

(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

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

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

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Ask about Petedunnite here :
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Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Petedunnite Specimen Label here :

Petedunnite

Ca(Zn,Mn++,Fe++,Mg)Si2O6
Dana No: 65.01.03a.05 Strunz No: 09.DA.15
Locality:

Notes: