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Momoiite (Momoiit)

Pictures (2 Images total)

Momoiit
Views (File:
1386158355
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Momoiit
grüner Momoiit, hellbraun Tephroit, leicht verwittert; Kurase Mine, Saijo, Ehime Präfektur, Shikoku, Japan
Copyright: Daisuke NISHIO-HAMANE; Contribution: Stefan
Location: Japan/Shikoku/Ehime, Präfektur/Saijo, Stadt/Kurase mine
Mineral: Momoiite
Image: 1386158355
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Momoiit

grüner Momoiit, hellbraun Tephroit, leicht verwittert; Kurase Mine, Saijo, Ehime Präfektur, Shikoku, Japan
Copyright: Daisuke NISHIO-HAMANE
Contribution: Stefan 2013-12-04
Locality: Kurase mine / Saijo, Stadt / Ehime, Präfektur / Shikoku / Japan
Momoiit
Views (File:
1386158387
): 701
Momoiit
Poliertes Erz mit grünem Momoiit; Kurase Mine, Saijo, Ehime Präfektur, Shikoku, Japan
Copyright: Daisuke NISHIO-HAMANE; Contribution: Stefan
Location: Japan/Shikoku/Ehime, Präfektur/Saijo, Stadt/Kurase mine
Mineral: Momoiite
Image: 1386158387
License: Usage for Mineralienatlas project only
Momoiit

Poliertes Erz mit grünem Momoiit; Kurase Mine, Saijo, Ehime Präfektur, Shikoku, Japan
Copyright: Daisuke NISHIO-HAMANE
Contribution: Stefan 2013-12-04
Locality: Kurase mine / Saijo, Stadt / Ehime, Präfektur / Shikoku / Japan

Collectors Summary

Hardness (Mohs) 6.5
Crystal System kubisch, Ia3d

Chemism

Chemical formula

{Mn2+3}[V3+2](Si3)O12

Additional chem. information

Granat-Gruppe

Chemical composition

Mangan, Silicium, Sauerstoff, Vanadium

Unit weight: 542.9469197 u; Number of atoms in the formula: 20

Info

Empirical formula:

{Mn3}[V2](Si3)O12

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

35.36

12

60.00

15.9994300

191.9931600
Silicon

Si

15.52

3

15.00

28.0855300

84.2565900
Vanadium

V

18.76

2

10.00

50.9415100

101.8830200
Manganese

Mn

30.36

3

15.00

54.9380499

164.8141497

Analysis wt%

SiO2 : 35.02, Al2O3 : 5.12, V2O3 : 21.96, FeO : 0.05, MgO : 0.28, MnO : 24.74, CaO : 12.24 (Ref: JMPS2010)

Strunz 9th edition incl. updates

9.AD.25

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
D: Insel(Neso)silikate ohne weitere Anionen; Kationen in oktahedraler [6] und gewöhnlich größerer Koordination
25:Granat-Gruppe

Lapis Classification

VIII/A.08-138

VIII: SILIKATE
A: Inselsilikate mit [SiO4] 4--Baugruppen
8: Kationen in kubischer und oktaedrischer Koordination [8+6]; Granat-Gruppe

Classification by Hölzel

9.AC.170

9: SILICATES
A: Nesosilicates
C: Garnet-Group
1: Pyralspites - 8-coord. Mg, Fe(2+), Mn(2+); Pyrope - Spessartine-Group

IMA status

Anerkanntes Mineral - IMA-WEB-Seite, Neue Mineralien Aug 2009

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Garnet supergroup  ⇒ Silicate garnets; Garnet group (Z charge 12)

Optical Properties

RI value α / ω / n

1.86

Ri mean

1.869

2V angle

Isotropisch

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

230

Space Group

Ia3d

Cell parameters a (Å)

11.924

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volumne (ų)

1695.375

X-Ray Powder Diffraction

2.982(78), 2.667(100), 2.435(42), 2.339(20), 2.178(20), 1.935(21), 1.654(20), 1.594(30)
XRD chart Momoiite

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

Physical Properties

Hardness (Mohs)

6.5

VHN (Hardness Vickers)

960 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.01 (berechnet)

4.254 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Japan/Shikoku/Ehime, Präfektur/Saijo, Stadt/Kurase mine

Preface

Name from

Prof. Hitoshi Momoi

Author (Name, Year)

Hidekazu Tanaka, 2009

Additional Information

Previously described as "Yamatoite", which was later discredited because the type material contained only about 40% of the Mn-V-garnet molecule.

References

IMA-WEB-Seite, Neue Mineralien Aug 2009

Grew, E.S., Locock, A.J., Mills, S.J., Galuskina, I.O., Galuskin, E.V., Halenius, U., 2012; Nomenclature of the garnet supergroup. American Mineralogist; preprint December 2012 - [Formel].

http://www.issp.u-tokyo.ac.jp/labs/mdcl/lab/denken/wordpress/?page_id=264

IMA group assignments

Other languages

German

Momoiit

Spanish

Momoiita

English

Momoiite

Russian

Момоиит

Japanese

桃井石榴石

CNMNC (IMA)-Number

IMA 2009-026

CNMNC symbol

Symbol

Mom

IDs

GUSID (Global unique identifier short form) k-XaQrCoukCHt4pyqQc0oA
GUID (Global unique identifier) 42DAE593-A8B0-40BA-87B7-8A72A90734A0
Database ID 5253