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Mejillonesite

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Mejillonesit
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Mejillonesit
Kristallgröße: 0,4 mm, Fundort: Halbinsel Mejillones, Provinz Antofagasta, II. Region, Chile
Copyright: Luigi Mattei; Contribution: thdun5
Location: Chile/Antofagasta, Region (II. Region)/Antofagasta, Provinz/Mejillones/Mejillones, Halbinsel
Mineral: Mejillonesite
Image: 1378224427
Rating: 5 (votes: 1)
License: Usage for Mineralienatlas project only
Mejillonesit

Kristallgröße: 0,4 mm, Fundort: Halbinsel Mejillones, Provinz Antofagasta, II. Region, Chile

Copyright: Luigi Mattei
Contribution: thdun5 2013-09-03
Locality: Mejillones, Halbinsel / Mejillones / Antofagasta, Provinz / Antofagasta, Region (II. Region) / Chile

Collectors Summary

Cleavages vollkommen (100), gut (010),(001)
Fracture abgestuft
Crystal System orthorhombisch, Pbca

Chemism

Chemical formula

NaMg2(PO3OH)(PO4)H(OH)·2H2O

Chemical composition

Magnesium, Natrium, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 316.5967716 u; Number of atoms in the formula: 23

Info

Empirical formula:

NaMg2(PO3OH)(PO4)H(OH)·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.23

7

30.43

1.0079470

7.0556290

Oxygen

O

55.59

11

47.83

15.9994300

175.9937300

Sodium

Na

7.26

1

4.35

22.9897702

22.9897702

Magnesium

Mg

15.35

2

8.70

24.3050600

48.6101200

Phosphorus

P

19.57

2

8.70

30.9737612

61.9475224

Analysis wt%

P2O5 : 46.87, MgO : 26.82, Na2O : 9.19, H2O : 19.00 (Ref: American Mineralogist 2012)

Strunz 9th edition incl. updates

8.CH.50

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
H: Mit großen und mittelgroßen Kationen, RO4:H2O < 1:1
50:Bakhchisaraitsevit-Gruppe

Lapis Classification

VII/D.38-010

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
D: Wasserhaltige Phosphate, mit fremden Anionen
38: Mittelgroße und sehr große Kationen: Al-Mg und Ca-Na-K

Classification by Hölzel

8.DJ.430

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
J: Lavendulan-Group

IMA status

anerkannt, Jan. 2011 - CNMNC Newsletter No. 8, April 2011

Mineral status

anerkanntes Mineral

Optical Properties

max. Birefringence

0.024

Birefringence chart\! Mejillonesite title=Birefringence chart Mejillonesite

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

1.507

RI value β

1.531

RI value γ / ε

1.531

Ri mean

1.523

2V angle

Biaxial (-) 15°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

61

Space Group

Pbca

Cell parameters a (Å)

16.295

Cell parameters b (Å)

13.009

Cell parameters c (Å)

8.434

Cell parameters a/b or c/a

1.253

Cell parameters c/b

0.648

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volume (ų)

1787.853

Crystal structure

Neuer Strukturtyp, Struktur bestimmt

X-Ray Powder Diffraction

8.095(100), 6.846(9), 6.470(8), 3.317(5), 2.959(5), 2.706(12), 2.157(19), 2.153(9)

XRD chart Mejillonesite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

VHN (Hardness Vickers)

190 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.352 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (100), gut (010),(001)

Fracture

abgestuft

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Chile/Antofagasta, Region (II. Region)/Antofagasta, Provinz/Mejillones/Mejillones, Halbinsel/Cerro Mejillones

Type material

Museu de Geociências, Instituto de Geociências, Universidade de Sa˜o Paulo, Sa˜o Paulo, Brazil und im Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russland

Collection number of type material

DR712 (Museu de Geociências), 4043/1 (Fersman Mineralogical Museum)

Preface

Name from

Typlokalität

Author (Name, Year)

Daniel Atencio, Nikita V. Chukanov, Fabrizio Nestola, Thomas Witzke, Jose´ M.V. Coutinho, Aleksandr E. Zadov, Reynaldo R. Contreira Filho und Gunnar Färber (2011)

References

CNMNC Newsletter No. 8, April 2011, page 291; Mineralogical Magazine, 75, 289-294.

Other languages

German

Mejillonesit

English

Mejillonesite

CNMNC (IMA)-Number

IMA 2010-068

CNMNC symbol

Symbol

Mej

IDs

GUSID (Global unique identifier short form) Mb-SBxlgMUG5ngb6fN1tTg
GUID (Global unique identifier) 0792BF31-6019-4131-B99E-06FA7CDD6D4E
Database ID 6997