Donpeacorite Mineral Data

Donpeacorite Mineral Data +

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General Donpeacorite Information

Chemical Formula:

(Mn,Mg)MgSi2O6

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

Empirical Formula:

Mn²⁺_0.75Mg_1.25Si₂O₆

IMA Status:

Approved IMA 1984

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 30676

PDF 38-358

Donpeacorite Image

Images:

Click Here for Larger Donpeacorite Image

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

Donpeacorite Crystallography

Axial Ratios:

a:b:c =2.0707:1:0.5886

Cell Dimensions:

a = 18.384, b = 8.878, c = 5.226, Z = 8; V = 852.95 Den(Calc)= 3.48

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bca

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

By Intensity(I/I_o): 3.18(1), 2.896(0.6), 4.03(0.1),

Crystal Structure:

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Petersen E U , Anovitz L M , Essene E J , American Mineralogist , 69 (1984) p.472-480, Donpeacorite, (Mn,Mg)MgSi2O6, a new orthopyroxene and its proposed phase, relations in the system MnSiO3-MgSiO3-FeSiO3

View Additional jPOWD Structure files for Donpeacorite
[1] [2] [3] [4] [5] [6]

Physical Properties of Donpeacorite

Cleavage:

[110] Perfect

Color:

Yellow orange.

Density:

3.36

Diaphaniety:

Transparent to Translucent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Optical Properties of Donpeacorite

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

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

Electron Density:

r_electron=3.30 gm/cc
note: r_Donpeacorite=3.36 gm/cc.

Fermion Index

Fermion Index = 0.0255
Boson Index = 0.9745

Photoelectric:

PE_Donpeacorite= 5.91 barns/electron
U=PE_Donpeacorite x r_electron= 19.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Donpeacorite is Not Radioactive

Donpeacorite Classification

Dana Class:

65.1.2.3 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.1)with chains P=2

(65.1.2)Orthopyroxenes

65.1.2.1 Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m

65.1.2.2 Ferrosilite (Fe,Mg)2Si2O6 P bca 2/m 2/m 2/m

65.1.2.3 Donpeacorite (Mn,Mg)MgSi2O6 P bca 2/m 2/m 2/m

Strunz Class:

VIII/F.02-30 VIII - Silicates

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

VIII/F.02 - Pyroxene group, Orthopyroxene

VIII/F.02-10 Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m

VIII/F.02-20 Ferrosilite (Fe,Mg)2Si2O6 P bca 2/m 2/m 2/m

VIII/F.02-30 Donpeacorite (Mn,Mg)MgSi2O6 P bca 2/m 2/m 2/m

VIII/F.02-40 Nchwaningite Mn2SiO3(OH)2·(H2O) P ca2₁ mm2

Other Donpeacorite Information

References:

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

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Donpeacorite

(Mn,Mg)MgSi2O6
Dana No: 65.1.2.3 Strunz No: VIII/F.02-30
Locality:

Notes: