Chopinite (original) (raw)

A valid IMA mineral species

About ChopiniteHide

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Specific Gravity:

3.34 (Calculated)

Crystal System:

Monoclinic

Name:

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:29096:4

ebf6569a-01df-49a3-bc69-a3b8917614ac

IMA Classification of ChopiniteHide

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Type description reference:

Grew, Edward S., Armbruster, Thomas, Medenbach, Olaf, Yates, Martin G., Carson, Christopher 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 (2) 229-245 doi:10.1127/0935-1221/2007/0019-1712

Classification of ChopiniteHide

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8.AB.15

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
B : With medium-sized cations

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of ChopiniteHide

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Cleavage:

Distinct/Good
Possibly {001} and {100}

Density:

3.34 g/cm3 (Calculated)

Optical Data of ChopiniteHide

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RI values:

_n_α = 1.595(2) _n_β = 1.648(2) _n_γ = 1.656(2)

2V:

Measured: 40° (2), Calculated: 41°

δ = 0.061

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of ChopiniteHide

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Crystallography of ChopiniteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 5.9305(7) Å, b = 4.7583(6) Å, c = 10.2566(10) Å
β = 90.663(9)°

Ratio:

a:b:c = 1.246 : 1 : 2.156

Unit Cell V:

289.41 ų (Calculated from Unit Cell)

Twinning:

Extensive polysynthetic twinning

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0007216	Chopinite	Grew E S, Armbruster T, 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	2007	Brattnevet, Larsemann Hills, Prydz Bay, East Antarctica	0	293
0016699	Chopinite	Berthet G, Joubert J, Bertaut E (1972) Vacancies ordering in new metastable orthophosphates (Co3)P2O8 and (Mg3)P2O8 with olivine-related structure _cod_database_code 1008830 Zeitschrift fur Kristallographie 136 98-105		1972	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of ChopiniteHide

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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.

Reference:

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

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Other Language Names for ChopiniteHide

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Relationship of Chopinite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

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

Internet Links for ChopiniteHide

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References for ChopiniteHide

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Reference List:

Grew, Edward S., Armbruster, Thomas, Medenbach, Olaf, Yates, Martin G., Carson, Christopher 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 (2) 229-245 doi:10.1127/0935-1221/2007/0019-1712

Grew, E.S., Yates, M.G., Beane, R.J., Floss, C., Gerbi, C. (2010) Chopinite-sarcopside solid solution, (Mg,Fe)32, in GRA95209, a transitional acapulcoite; Implications for phosphate genesis in meteorites. American Mineralogist: 95: 260-272.

Leyx, C., Schmid-Beurmann, P., Brunet, F., Chopin, C., Lathe, C. (2024) Compressibility and thermal expansion of magnesium phosphates. European Journal of Mineralogy, 36 (3) 417-431 doi:10.5194/ejm-36-417-2024

Localities for ChopiniteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.