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Roméite group (Roméit-Gruppe)

Pictures (8 Images total)

Roméit
Views (Image: 1265018826): 1900
Roméit

Größe: 1,18 mm; Fundort: Mina Praborna, Vallée St. Marcel, Aostatal, Italien
Collection: Domenico Preite
Copyright: Matteo Chinellato
Contribution: Hg 2010-02-01
Locality: Mina Praborna / Saint-Marcel / Aostatal (Valle d'Aosta), Region / Italien
Roméit xx
Views (Image: 1335259715): 1598
Roméit xx

Grube Starlera Val Ferrera Graubünden Schweiz. BB=15mm.
Collection: pilzpirat
Copyright: pilzpirat
Contribution: pilzpirat 2012-04-24
Locality: Grube Starlera / Val Starlera / Innerferrera / Ferrera / Viamala, Region / Graubünden, Kanton / Schweiz
Romeit xx
Views (Image: 1155592912): 1811
Romeit xx

Orange etwa 2 mm große Romeit-Kristalle; Stufengröße etwa 38 mm; Fundort: Starlera Mangan Mine, Starlera, Val Ferrera, Graubünden, Schweiz
Copyright: Andi_Y
Contribution: Andi_Y 2006-08-15
Locality: Grube Starlera / Val Starlera / Innerferrera / Ferrera / Viamala, Region / Graubünden, Kanton / Schweiz
Roméit
Views (Image: 1268607765): 1772
Roméit

gelber Oktaeder; Kristallgröße: 5 mm; Fundort: Grube Starlera, Val Starlera, Val Ferrera, Hinterrheintal, Graubünden, Schweiz
Copyright: Matteo Chinellato
Contribution: slugslayer 2010-03-15
Locality: Grube Starlera / Val Starlera / Innerferrera / Ferrera / Viamala, Region / Graubünden, Kanton / Schweiz
Roméit
Views (Image: 1271354682): 1524
Roméit

Kristallgröße: 0,4 mm, Fundort: Mina Praborna, Vallée St. Marcel, Aostatal, Italien.
Copyright: Luigi Mattei
Contribution: thdun5 2010-04-15
Locality: Mina Praborna / Saint-Marcel / Aostatal (Valle d'Aosta), Region / Italien
Roméit
Views (Image: 1283687713): 644
Roméit

Größe: 6,7 x 4,4 x 2,2 cm, Fundort: Långban, Filipstad, Värmland, Schweden
Copyright: Rob Lavinsky
Contribution: thdun5 2010-09-05
Locality: Långban Fe-Mn-(Ba-As-Pb-Sb) Lagerstätte / Långban, Distrikt / Filipstad, Gemeinde / Värmland, Provinz / Schweden

Collectors Summary

Color gelbbraun
Streak color blassgelb
Hardness (Mohs) 5.50 - 6.00
Cleavages undeutlich
Crystal System kubisch, Fd3m

Additional information / Summary

Die bisher als Roméit beschriebenen Mineralien sind entweder Fluornatroroméit, Fluorcalcioroméit oder Oxycalcioroméit

Chemism

Chem­ical formula

(Ca,Fe2+,Mn,Na)2(Sb,Ti)2O6(O,OH,F)

Chem­ical com­po­si­tion

Antimon, Calcium, Eisen, Mangan, Natrium, Titan, Fluor, Sauerstoff, Wasserstoff

Unit weight: 410.051938425 u; Number of atoms in the formula: 11.3

Info

Empirical formula:

(Ca0.55Fe0.3Mn0.1Na0.05)2(Sb0.75Ti0.25)2O6(O0.6(OH)0.3F0.1)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.07

0.3

2.65

1.0079470

0.3023841
Oxygen

O

26.92

6.9

61.06

15.9994300

110.3960670
Fluorine

F

0.46

0.1

0.88

18.9984033

1.8998403
Sodium

Na

0.56

0.1

0.88

22.9897702

2.2989770
Calcium

Ca

10.75

1.1

9.73

40.0784000

44.0862400
Titanium

Ti

5.84

0.5

4.42

47.8671000

23.9335500
Manganese

Mn

2.68

0.2

1.77

54.9380499

10.9876100
Iron

Fe

8.17

0.6

5.31

55.8452000

33.5071200
Antimony

Sb

44.54

1.5

13.27

121.7601000

182.6401500

Clas­sifica­tion by Hölzel

4.CK.

4: OXIDES
C: R2O3 Sesquioxides
K: Romeite-Group, Sb-dominant on the B-site

IMA sta­tus

Als Mineralgruppe anerkannt - The Canadian Mineralogist Vol. 48, pp. 673-698 (2010)

Min­eral sta­tus

Reihe/Gruppe/Serie/Folge

IMA Classification

IMA Clas­sifica­tion

 Pyrochlore supergroup

Optical Properties

Color

gelbbraun

Streak color

blassgelb

Crystallography

Crystal Sys­tem

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

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

X-Ray Pow­der Diffrac­tion

5.92(60),
3.10(50),
2.971(100),
1.819(70),
1.550(80),
1.180(30),
1.150(30),
1.049(30)
XRD chart Roméite group

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

Crystals 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

5.50 - 6.00

Cleav­ages

undeutlich

(Co-)Type locality

(Co-)Type locality

Italien/Aostatal (Valle d'Aosta), Region/Saint-Marcel/Mina Praborna

Preface

Author (Name, Year)

Damour, 1841

References

Handbook of Mineralogy (Anthony et al.), 3 (1997), 479

The Pyrochlore Supergroup of Minerals: Nomenclature; The Canadian Mineralogist Vol. 48, pp. 673-698 (2010)

Ferdinando Bosi, Andrew G. Christy and Ulf Hålenius: Crystal-chemical aspects of the roméite group, A2Sb2O6Y, of the pyrochlore supergroup. Mineralogical Magazine Vol. 81, Nr. 6 (2017) S.1287-1302.

IMA group assignments

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

'Roméite group'

(Ca,Fe2+,Mn,Na)2(Sb,Ti)2O6(O,OH,F)

kubisch : m3m : Fd3m

4.CK.

'Partzite'

Cu2Sb2(O,OH)7

kubisch : m3m : Fd3m

4.CK.012

'Stetefeldtite' (Var.v. Roméite group)

Ag2Sb2(O,OH)7

kubisch : m3m

4.CK.013

Fluornatroroméite

(Na,Ca)2Sb2(O,OH)6F

4.CK.020

Hydroxycalcioroméite

(Ca,Sb3+)2(Sb5+,Ti4+)2O6(OH)

kubisch : m3m : Fd3m

4.CK.110

Fluorcalcioroméite

(Ca,Na)2Sb5+2O6(F,OH)

kubisch : m3m : Fd3m

4.CK.120

Oxycalcioroméite

Ca2Sb2O6O

kubisch : m3m : Fd3m

4.CK.140

Oxyplumboroméite

Pb2Sb5+2O7

kubisch : m3m : Fd3m

4.CK.441

'Monimolite' (Var.v. Roméite group)

(Pb,Ca)3Sb2O8

4.CK.442

'Bismutostibiconite'

(Bi,Fe3+,☐)2Sb5+2O7

kubisch : m3m : Fd3m

4.CK.506

'Stibiconite' (Var.v. Roméite group)

Sb3+Sb5+2O6(OH)

kubisch : m3m : Fd3m

4.CK.511

Varieties

Monimolite

Stetefeldtite

Stibiconite

Alternative Name

French

Roméine

German

Roméit

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

German pages

 DeWikiPedia - search for: Roméit-Gruppe
Google-Bilder-Suche - search for: Roméit-Gruppe
Mineralogisch-Petrographisches-Institut Hamburg - search for: Roméit-Gruppe

English pages

 Mindat - search for: Roméite group
Webmineral - search for:Roméite group
Handbook-of-Mineralogy - search for: Roméite group
RRUFF - Raman, XRD and other mineral data - search for: Roméite group
RRUFF - References and PDF downloads - search for: Roméite group
American-Mineralogist-Crystal-Structure-Database - search for: Roméite group
Athena - search for: Roméite group

Russian pages

 Webmineral.ru - search for: Ромеит

Mineral Dealer

German pages

 hausen - Mineralgroßhandel - search for: Roméit-Gruppe
Crystal-Treasure.com - search for: Roméit-Gruppe
Bosse - search for: Roméit-Gruppe

Locations with GPS information