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Chopinite (Chopinit)

Additional Functions

Collectors Summary

Color farblos
Cleavages gut, möglicherweise (001) und (100)

Chemism

Chemical formula

(Mg,Fe)3(PO4)2

Additional chem. information

Mg-dominantes Analog von Sarkopsid

Chemical composition

Eisen, Magnesium, Phosphor, Sauerstoff

Unit weight: 286.5132474 u; Number of atoms in the formula: 13

Info

Empirical formula:

(Mg0.75Fe0.25)3(PO4)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

44.67

8

61.54

15.9994300

127.9954400
Magnesium

Mg

19.09

2.25

17.31

24.3050600

54.6863850
Phosphorus

P

21.62

2

15.38

30.9737612

61.9475224
Iron

Fe

14.62

0.75

5.77

55.8452000

41.8839000

Analysis wt%

P2O5 : 47.32, FeO : 20.99, MgO : 30.35 (Ref: European Journal of Mineralogy 2007)

Strunz 9th edition incl. updates

8.AB.15

8: Phosphate, Arsenate, Vanadate
A: Phosphate, etc., ohne weitere Anionen, ohne H2O
B: Mit mittelgroßen [Kationen]
15:Sarkopsid-Gruppe

Lapis Classification

VII/A.04-005

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
A: Wasserfreie Phosphate [PO4] 3-, ohne fremde Anionen
4: Mittelgroße Kationen: Fe-Mn vorwiegend

Classification by Hölzel

8.AB.345

8: PHOSPHATES ARSENATES VANADATES
A: Phosphates (-anions -water)
B: Phosphates, C medium Triphylite-Group
3: Graftonite-Sarcopside-Group

IMA status

anerkannt 04/2006

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Diaphaneity (Transparency)

transparent

max. Birefringence

0.061
Birefringence chart\! Chopinite title=Birefringence chart Chopinite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.595

RI value β

1.648

RI value γ / ε

1.656

Ri mean

1.633

2V angle

Biaxial (-) 40°

Crystallography

Cell parameters a (Å)

5.931

Cell parameters b (Å)

4.758

Cell parameters c (Å)

10.257

Cell parameters a/b or c/a

1.247

Cell parameters c/b

2.156

Cell parameters α

90°

Cell parameters β

90.67

Cell parameters γ

90°

Z

2

Volume (ų)

289.4

X-Ray Powder Diffraction

5.92(42), 4.31(29), 3.84(100), 3.48(37), 2.97(25), 2.77(46), 2.51(59), 2.44(40)
XRD chart Chopinite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

3.34 berechnet

3.288 ( ρ calc. Mineralienatlas )

Cleavages

gut, möglicherweise (001) und (100)

(Co-)Type locality

(Co-)Type locality

Antarktika/Ostantarktis/Princess-Elizabeth-Land/Ingrid-Christensen-Küste/Prydz Bay/Larsemann Hills/Stornes Halbinsel/Tassie Tarn

Preface

Name from

dem französischem Mineralogen-Petrologen Christian Chopin

References

Grew, E.S., Armbruster, Th., Medenbach, O., Yates, M.G., Carson, C.J. (2006): 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, 18, (in press).

Brunet, F., Chopin, C., Seifert, F. (1998): Phase relations in the MgO-P2O5-H2O system and the stability of phosphoellenbergerite: petrological implications. Contributions to Mineralogy and Petrology, 131, 54-70.
Mineralien Welt 04/08, Steffen Jahn, Die neuen Mineralien 2007 - 2008

Other languages

German

Chopinit

English

Chopinite

Russian

Шопенит

Russian

Шопинит

Simplified Chinese

磷铁镁石

CNMNC (IMA)-Number

IMA 2006-004

CNMNC symbol

Symbol

Cpn

IDs

GUSID (Global unique identifier short form) sWsC7o892Uq-Sj4_q3oJEg
GUID (Global unique identifier) EE026BB1-3D8F-4AD9-BE4A-3E3FAB7A0912
Database ID 4402