Petedunnite Mineral Data

Petedunnite Mineral Data +

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.

Synonym:

ICSD 81450

PDF 40-495

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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

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

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

Physical Properties of Petedunnite

Cleavage:

[110] Good

Color:

Dark green.

Density:

3.68

Diaphaniety:

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= 0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.189,KPDmeas= 0.1875,KC= 0.1922

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:

r_electron=3.58 gm/cc
note: r_Petedunnite=3.65 gm/cc.

Fermion Index

Fermion Index = 0.01777
Boson Index = 0.98223

Photoelectric:

PE_Petedunnite= 11.03 barns/electron
U=PE_Petedunnite x r_electron= 39.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Petedunnite is Not Radioactive

Petedunnite Classification

Dana Class:

65.1.3a.5 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.1)with chains P=2

(65.1.3a)C2/c clinopyroxenes (Ca clinopyroxenes)

65.1.3a.1 Diopside CaMgSi2O6 C 2/c 2/m

65.1.3a.2 Hedenbergite CaFeSi2O6 C 2/c 2/m

65.1.3a.3 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

65.1.3a.4 Johannsenite CaMnSi2O6 C 2/c 2/m

65.1.3a.5 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

65.1.3a.6 Esseneite CaFeAlSiO6 C 2/c 2/m

Strunz Class:

VIII/F.01-80 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si2O6]4-

VIII/F.01 - Pyroxene group, Clinopyroxene

VIII/F.01-10 Clinoenstatite Mg2Si2O6 P 2₁/c 2/m

VIII/F.01-20 Clinoferrosilite (Fe,Mg)2Si2O6 P 2₁/c 2/m

VIII/F.01-30 Kanoite (Mn,Mg)2Si2O6 P 2₁/c 2/m

VIII/F.01-40 Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 2₁/c 2/m

VIII/F.01-50 Diopside CaMgSi2O6 C 2/c 2/m

VIII/F.01-60 Hedenbergite CaFeSi2O6 C 2/c 2/m

VIII/F.01-70 Johannsenite CaMnSi2O6 C 2/c 2/m

VIII/F.01-80 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

VIII/F.01-90 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

VIII/F.01-100 Omphacite (Ca,Na)(Mg,Fe,Al)Si2O6 P 2/n 2/m

VIII/F.01-110 Esseneite CaFeAlSiO6 C 2/c 2/m

VIII/F.01-120 Spodumene LiAlSi2O6 C 2/c 2/m

VIII/F.01-130 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

VIII/F.01-140 Aegirine NaFeSi2O6 C 2/c 2/m

VIII/F.01-145 Namansilite NaMn(Si2O6) C 2/c 2/m

VIII/F.01-150 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

VIII/F.01-160 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

VIII/F.01-170 Kosmochlor NaCrSi2O6 C 2/c 2/m

Other Petedunnite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Petedunnite

Ca(Zn,Mn++,Fe++,Mg)Si2O6
Dana No: 65.1.3a.5 Strunz No: VIII/F.01-80
Locality:

Notes: