Donpeacorite Mineral Data

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

Environment:

In manganese-rich siliceous marbles metamorphosed to the upper amphibolite facies.

IMA Status:

Approved IMA 1984

Locality:

In the Balmat No. 4 mine, Balmat, St. Lawrence Co., New York, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Donald R. Peacor (1937- ), University of Michigan, Ann Arbor, Michigan, USA.

Name Pronunciation:

Donpeacorite + Pronunciation

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

Images:

Donpeacorite Turneaureite 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

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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
Ncalc = 1.68 - 1.71

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:

Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Donpeacorite =3.36 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Donpeacorite= 5.91 barns/electron
U=PE_Donpeacorite x rElectron Density= 19.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Donpeacorite is Not Radioactive

Donpeacorite Classification

Dana Class:

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

(65.01)with chains P=2

(65.01.02)Orthopyroxenes

65.01.02.01 Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m

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

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

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

References:

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

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
15 - WWW-MINCRYST

Search for Donpeacorite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Donpeacorite :

A Bijoux Google Search for Donpeacorite
Adam's Minerals Google Search for Donpeacorite
Cape Minerals Google Search for Donpeacorite
Dakota Matrix Minerals Google Search for Donpeacorite
Excalibur Mineral Corp. Google Search for Donpeacorite
Exceptional Minerals Google Search for Donpeacorite
John Betts Fine Minerals Search for Donpeacorite
McDougall Minerals Google Search for Donpeacorite
Mineral News Website Link
Rock and Mineral Shows Google Search for Donpeacorite
Weinrich Minerals, Inc. Google Search for Donpeacorite

Ask about Donpeacorite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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 Donpeacorite Specimen Label here :

Donpeacorite

(Mn,Mg)MgSi2O6
Dana No: 65.01.02.03 Strunz No: 09.DA.05
Locality:

Notes: