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Christian Chopin
Specific Gravity:
3.34 (Calculated)
Crystal System:
Named in honor of Christian Chopin (1955), French mineralogist and petrologist, Directeur de recherche au CNRS, for his major contributions to the mineralogy of phosphates.
Dimorph of:
Mg-dominant analogue of sarcopside.

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Classification of ChopiniteHide

Approval Year:
First Published:

A : Phosphates, etc. without additional anions, without H2O
B : With medium-sized cations
Dana 7th ed.:

Physical Properties of ChopiniteHide

Possibly {001} and {100}
3.34 g/cm3 (Calculated)

Optical Data of ChopiniteHide

Biaxial (-)
RI values:
nα = 1.595(2) nβ = 1.648(2) nγ = 1.656(2)
Measured: 40° (2), Calculated: 41°
Max Birefringence:
δ = 0.061
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Not visible

Chemical Properties of ChopiniteHide

IMA Formula:

Crystallography of ChopiniteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 5.9305(7) Å, b = 4.7583(6) Å, c = 10.2566(10) Å
β = 90.663(9)°
a:b:c = 1.246 : 1 : 2.156
Unit Cell V:
289.41 ų (Calculated from Unit Cell)
Extensive polysynthetic twinning

X-Ray Powder DiffractionHide

Powder Diffraction Data:
5.92 Å(42)
4.31 Å(29)
3.84 Å(100)
3.48 Å(37)
2.97 Å(25)
2.77 Å(46)
2.51 Å(59)
2.44 Å(40)

Type Occurrence of ChopiniteHide

General Appearance of Type Material:
anhedral and range from 0.1 × 0.3 mm to 0.2 × 0.6 mm in size
Place of Conservation of Type Material:
Holotype material (sample no. 121401E and thin section 121401E4) is deposited in the Musee de Mineralogie, Ecole
des Mines de Paris as catalogue number M 73096.
Geological Setting of Type Material:
Metamorphic fluorapatite segregation in granulite-facies.
Grew, E.S., Armbruster, Th., Medenbach, O., Yates, M.G., Carson, C.J. (2007) Chopinite, (Mg,Fe)3(PO4)2, a new mineral isostructural with sarcopside, from a fluorapatite segregation in granulite-facies paragneiss, Larsemann Hills, Prydz Bay, East Antarctica. European Journal of Mineralogy: 19: 229-245.

Synonyms of ChopiniteHide

Other Language Names for ChopiniteHide

Simplified Chinese:磷铁镁石

Relationship of Chopinite to other SpeciesHide

Other Members of this group:
Sarcopside(Fe2+,Mn2+,Mg)3(PO4)2Mon. 2/m : P21/b
Zavalíaite(Mn2+,Fe2+,Mg)3(PO4)2Mon. 2/m : P21/b

Related Minerals - Nickel-Strunz GroupingHide

8.AB.BorisenkoiteCu3[(V,As)O4]2Mon. 2/m : P21/b
8.AB.05FarringtoniteMg3(PO4)2Mon. 2/m
8.AB.10Heterosite(Fe3+,Mn3+)PO4Orth. mmm (2/m 2/m 2/m) : Pmna
8.AB.10LithiophiliteLiMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
8.AB.10NatrophiliteNaMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
8.AB.10PurpuriteMn3+(PO4)Orth. mmm (2/m 2/m 2/m) : Pmna
8.AB.10TriphyliteLiFe2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
8.AB.10KarenwebberiteNaFe2+PO4Orth. mmm (2/m 2/m 2/m) : Pnma
8.AB.15Sarcopside(Fe2+,Mn2+,Mg)3(PO4)2Mon. 2/m : P21/b
8.AB.20BeusiteMn2+Mn2+2 (PO4)2Mon.
8.AB.20GraftoniteFe2+Fe2+2(PO4)2Mon. 2/m : P21/b
8.AB.25XanthiositeNi3(AsO4)2Mon. 2/m : P21/b
8.AB.30Lammerite-βCu3(AsO4)2Mon. 2/m : P21/b
8.AB.35StranskiiteZn2Cu(AsO4)2Tric. 1 : P1
8.AB.35PseudolyonsiteCu3(VO4)2Mon. 2/m : P21/b

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ChopiniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grew, E.S., Armbruster, Th., Medenbach, O., Yates, M.G., Carson, C.J. (2007) Chopinite, (Mg,Fe)3(PO4)2, a new mineral isostructural with sarcopside, from a fluorapatite segregation in granulite-facies paragneiss, Larsemann Hills, Prydz Bay, East Antarctica. European Journal of Mineralogy: 19: 229-245.
Tait, K., Poirier, G., Rowe, R., Piilonen, P.C. (2008) New mineral names. American Mineralogist: 93: 252-256.
Grew, E.S., Yates, M.G., Beane, R.J., Floss, C., Gerbi, C. (2010) Chopinite-sarcopside solid solution, [(Mg,Fe)3](PO4)2, in GRA95209, a transitional acapulcoite; Implications for phosphate genesis in meteorites. American Mineralogist: 95: 260-272.

Internet Links for ChopiniteHide

Localities for ChopiniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Antarctica (TL)
  • Eastern Antarctica
    • Princess Elizabeth Land
      • Ingrid Christensen Coast
        • Prydz Bay
          • Larsemann Hills (Larseman Hills)
European Journal of Mineralogy, 19, 229-245(2007)[abstr: Am. Min. 93,255]
    • Transantarctic Mts
      • Wisconsin Range
        • Graves Nunataks meteorites
Grew, E.S., Yates, M.G., Beane, R.J., Floss, C. and Gerbi, C. (2010) Chopinite-sarcopside solid solution, [(Mg,Fe)3vac](PO4)2, in GRA95209, a transitional acapulcoite: Implications for phosphate genesis in meteorites. American Mineralogist, 95, 260-272
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