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Momoiite

Pictures (2 Images total)

Momoiit
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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 (Image: 1386158387): 676
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

 
Garnet supergroup
{X3}[Y2](Z3)φ12
 
 

 
 
Silicate garnets; Garnet group (Z charge 12)
 
 
 

 
 
 
Almandine
{Fe2+3}[Al2](Si3)O12
kubisch
Ia3d

 
 
 
Andradite
{Ca3}[Fe3+2](Si3)O12
kubisch
Ia3d

 
 
 
Calderite
{Mn2+3}[Fe3+2](Si3)O12
kubisch
Ia3d

 
 
 
Eringaite
{Ca3}[Sc2](Si3)O12
kubisch
Ia3d

 
 
 
Goldmanite
{Ca3}[V3+2](Si3)O12
kubisch
Ia3d

 
 
 
Grossular
{Ca3}[Al2](Si3)O12
kubisch
Ia3d

 
 
 
Hutcheonite
{Ca3}[Ti2](SiAl2)O12
kubisch
Ia3d

 
 
 
Knorringite
{Mg3}[Cr3+2](Si3)O12
kubisch
Ia3d

 
 
 
Majorite
{Mg3}[MgSi](Si3)O12
kubisch
 

 
 
 
Menzerite-(Y)
{Y2Ca}[Mg2](Si3)O12
kubisch
Ia3d

 
 
 
Momoiite
{Mn2+3}[V3+2](Si3)O12
kubisch
Ia3d

 
 
 
Morimotoite
{Ca3}[TiFe2+](Si3)O12
kubisch
Ia3d

 
 
 
Pyrope
{Mg3}[Al2](Si3)O12
kubisch
Ia3d

 
 
 
Spessartine
{Mn2+3}[Al2](Si3)O12
kubisch
Ia3d

 
 
 
Uvarovite
{Ca3}[Cr3+2](Si3)O12
kubisch
Ia3d

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Actuality: 03. Jul 2022 - 00:07:01

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

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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