Mineralogy Database

Chopinite Mineral Data

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General Chopinite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Fe)3(PO4)2
Help on Composition: Composition: Molecular Weight = 291.81 gm
   Calcium      0.27 %  Ca    0.38 % CaO
   Magnesium   18.32 %  Mg   30.39 % MgO
   Manganese    0.19 %  Mn    0.24 % MnO
   Iron        16.46 %  Fe   21.17 % FeO
   Silicon      0.19 %  Si    0.41 % SiO2
   Phosphorus  20.70 %  P    47.43 % P2O5
   Oxygen      43.86 %  O
              ______        ______ 
              100.00 %      100.03 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.02Mg2.2Fe2+0.86Mn2+0.01Si0.02P1.95O8
Help on Environment: Environment: Found in a fluorapatite segregation in a quartz mass roughly 10 cm thick and 3 m long in granulite-facies paragneiss. Mg-dominant analogue of sarcopside.
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: Brattnevet Peninsula, Larsemann Hills, Prydz Bay, East Antarctica. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Christian Chopin, research director at Centre national de la recherche scientifique (CNRS).
Help on Synonym: Synonym: IMA2006-004

Chopinite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.2463:1:2.1555
Help on Cell Dimensions: Cell Dimensions: a = 5.9305, b = 4.7583, c = 10.2566, Z = 2; beta = 90.663° V = 289.41 Den(Calc)= 3.35
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.84(1), 2.51(0.59), 2.77(0.46),5.92(0.42), 2.44(0.4), 3.48(0.37), 4.31(0.29), 2.97(0.25),

Physical Properties of Chopinite

Help on Color: Color: Colorless.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: shite

Optical Properties of Chopinite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.189,KC= 0.1895
Ncalc = 1.63
Help on Optical Data: Optical Data: Biaxial (-), a=1.595, b=1.648, g=1.656, bire=0.0610

Calculated Properties of Chopinite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Chopinite =3.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEChopinite = 6.37 barns/electron
U=PEChopinite x rElectron Density= 20.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chopinite is Not Radioactive

Chopinite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.03)(A+ B++)3 (XO4)2
  (38.03.01)Sarcopside Group Sarcopside (Fe,Mn,Mg)3(PO4)2 P 21/a 2/m Farringtonite Mg3(PO4)2 P 21/a 2/m Chopinite! (Mg,Fe)3(PO4)2 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.AB.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AB -With medium-sized cations
08.AB.15 Sarcopside (Fe,Mn,Mg)3(PO4)2 P 21/a 2/m
08.AB.15 Chopinite! (Mg,Fe)3(PO4)2 P 21/c 2/m

Other Chopinite Information

Help on References: References: NAME( AmMin, v93:252) PHYS. PROP.(AmMin, v93:252) OPTIC PROP.(AmMin, v93:252)
Help on See Also: See Also: Links to other databases for Chopinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 08.AB.15





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