Mineralogy Database

Donpeacorite Mineral Data

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General Donpeacorite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Mg)MgSi2O6
Help on Composition: Composition: Molecular Weight = 223.75 gm
   Magnesium  13.58 %  Mg   22.52 % MgO
   Manganese  18.41 %  Mn   23.78 % MnO
   Silicon    25.10 %  Si   53.71 % SiO2
   Oxygen     42.90 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+0.75Mg1.25Si2O6
Help on Environment: Environment: In manganese-rich siliceous marbles metamorphosed to the upper amphibolite facies.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: In the Balmat No. 4 mine, Balmat, St. Lawrence Co., New York, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Donald R. Peacor (1937- ), University of Michigan, Ann Arbor, Michigan, USA.
Help on Name Pronunciation: Name Pronunciation: Donpeacorite + Pronunciation Say DONPEACORITE
Help on Synonym: Synonym: ICSD 30676
  PDF 38-358

Donpeacorite Image

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  Donpeacorite   Braunite-I

Comments: Brown crystalline massive donpeacorite with dark brown black braunite.
Location: Zinc Corporation of America Mine #4, Balmat, Saint Lawrence County, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Turneaureite   Donpeacorite   Parvowinchite

Comments: Colorless, transparent turneaureite masses with light brown tirodite (parvowinchite) and darker brown donpeacorite.
Location: 2500' level of the mine, ZCA Mine No. 4 (St Joe Mine; ZCA No. 4 mine), Balmat, Balmat-Edwards Zinc District, St Lawrence Co., New York, USA. Scale: Picture Size 0.5 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Donpeacorite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.0707:1:0.5886
Help on Cell Dimensions: Cell Dimensions: a = 18.384, b = 8.878, c = 5.226, Z = 8; V = 852.95 Den(Calc)= 3.48
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.18(1), 2.896(0.6), 4.03(0.1),

Physical Properties of Donpeacorite

Help on Cleavage: Cleavage: {110} Perfect
Help on Color: Color: Yellow orange.
Help on Density: Density: 3.36
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Donpeacorite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1966,KPDmeas= 0.2037,KC= 0.2036
Ncalc = 1.68 - 1.71
Help on Optical Data: Optical Data: Biaxial (-), a=1.677, b=1.684, g=1.692, bire=0.0150, 2V(Calc)=88, 2V(Meas)=88.

Calculated Properties of Donpeacorite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Donpeacorite =3.36 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEDonpeacorite = 5.91 barns/electron
U=PEDonpeacorite x rElectron Density= 19.49 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Donpeacorite is Not Radioactive

Donpeacorite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.01)with chains P=2
  (65.01.02)Orthopyroxenes Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m Ferrosilite (Fe,Mg)2Si2O6 P bca 2/m 2/m 2/m Donpeacorite (Mn,Mg)MgSi2O6 P bca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DA.05 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.05 Donpeacorite (Mn,Mg)MgSi2O6 P bca 2/m 2/m 2/m
09.DA.05 Akimotoite! (Mg,Fe)SiO3 R 3 3
09.DA.05 Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m
09.DA.05 Ferrosilite (Fe,Mg)2Si2O6 P bca 2/m 2/m 2/m

Other Donpeacorite Information

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

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Dana No: Strunz No: 09.DA.05





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