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Roméite Group

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System:IsometricColour:Yellowish to reddish ...
Hardness:5½ - 6½
Member of:Pyrochlore Supergroup
Name:
Named in 1841 by Augustin Alexis Damour in honor of Jean Baptiste Louis Romé de L'Isle [August 26, 1736 Gray, Haute-Saône, France - July 3, 1790 Paris, France], the "father of crystallography". He was first an officer in the French Army and he developed the science of crystallography while he was a private curator for wealthy collectors of coins, minerals, etc.


The nomenclature was recently revised by Atencio et al. (2010); see also Christy & Atencio (2013).

Classification of Roméite Group

IMA status:Group Name 2010
Strunz 8th edition ID:4/0.0-
Nickel-Strunz 10th (pending) edition ID:4.00.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
0 :
0 :
Dana 8th edition ID:44.1.1.3

44 : ANTIMONATES
1 : A2X2O6(O,OH,F)
Hey's CIM Ref.:24.2.3

24 : Antimonates and Antimonites
2 : Antimonates of Be, Mg, Ca, Zn or Hg
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Type Occurrence of Roméite Group

Type Locality:Prabornaz Mine (Praborna Mine), Saint-Marcel, Aosta Valley, Italy
Place of Conservation of Type Material:Natural History Museum, Paris, France: #41.151, #41.152.
Year of Discovery:1841

Occurrences of Roméite Group

Geological Setting:Metamorphosed hydrothermal manganese deposits

Physical Properties of Roméite Group

Lustre:Sub-Adamantine, Vitreous, Greasy
Diaphaneity (Transparency):Transparent, Translucent
Colour:Yellowish to reddish brown, dark brown, red, light yellow
Streak:Nearly colourless, pale yellow.
Hardness (Mohs):5½ - 6½
Cleavage:Poor/Indistinct
On {111}, poor.
Fracture:Irregular/Uneven, Splintery
Density (measured):4.95 - 5.41 g/cm3
Density (calculated):5.28 g/cm3

Crystallography of Roméite Group

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fd3m
Space Group Setting:Fd3m
Cell Parameters:a = 10.28(4) Å
Unit Cell Volume:V 1,086.37 ų (Calculated from Unit Cell)
Z:8
Morphology:Crystals octahedra, exhibiting subordinate forms {001}, {110}, {112}, {113}, and {133}. Crystalline aggregates, massive.
Twinning:Rare on {111}.
Crystal Atlas:
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Romeite no.1 - Goldschmidt (1913-1926)
Romeite no.3 - Goldschmidt (1913-1926)

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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Optical Data of Roméite Group

Type:Isotropic
RI values: n = 1.817 - 1.854
Maximum Birefringence:δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:Very High
Comments:May be anomalously biaxial, weak to moderate, and which may be distributed in zones or sectors.

The indices of refraction vary markedly with composition (e.g.: 1.817 to 1.88).

Relationship of Roméite Group to other Species

Member of:Pyrochlore Supergroup
Other Members of Group:

- +
Group Members:
Cuproroméite 
Cu
 
2
Sb
 
2
(O,OH)
 
7
Fluorcalcioroméite 
(Ca,Na)
 
2
Sb
5+
 
 
2
O
 
6
(F,OH)
Fluornatroroméite 
(Na,Ca)
 
2
Sb
 
2
(O,OH)
 
6
F
Hydroxycalcioroméite 
(Ca,Sb
3+
 
)
 
2
(Sb
5+
 
,Ti)
 
2
O
 
6
(OH)
Oxycalcioroméite 
Ca
 
2
Sb
 
2
O
 
7
Oxyplumboroméite 
Pb
 
2
Sb
 
2
O
 
7
Related Minerals - Nickel-Strunz Grouping):

- +
4.00.Microlite Group
4.00.Pyrochlore Group
A
 
2
Nb
 
2
(O,OH)
 
6
Z
4.00.Písekite-(Y)
(Y,As,Ca,Fe,U)(Nb,Ti,Ta)O
 
4
4.00.UM2004-19-O:AlCeGdZr
(Gd,Ce)
 
4
Al
 
2
Zr
 
4
O
 
17
4.00.UM2004-21-O:CaFeGdZr
Ca
 
2
Gd
 
4
Fe
 
5
ZrO
 
15
4.00.UM2004-27-O:GdTi
Gd
 
2
Ti
 
4
O
 
11
Related Minerals - Hey's Index Grouping:

- +
24.2.1Swedenborgite
NaBe
 
4
Sb
5+
 
O
 
7
24.2.2Byströmite
MgSb
 
2
O
 
6
24.2.4Ordoñezite
ZnSb
 
2
O
 
6
24.2.5Theisite
Cu
 
5
Zn
 
5
(AsO
 
4
,SbO
 
4
)
 
2
(OH)
 
14
24.2.6Shakhovite
(Hg
+
2
)Hg
2+
2
(Sb
3+
 
O
 
3
)(OH)
 
3

Other Names for Roméite Group

Other Languages:
French:Roméine
German:Romeit
Russian:Ромеит
Simplified Chinese:锑钙石
Spanish:Romeita
Traditional Chinese:銻鈣石
Varieties:
AtopiteBismutostibiconiteMauzeliiteMonimoliteSchneebergite (of Brezina)
StetefeldtiteStibiconiteWeslienite

Other Information

Other Information:Insoluble in acids. Decomposed by fusion with sodium carbonate.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Roméite Group

Reference List:

- +
Damour (1841) Annales des mines: 20: 247 (as Roméine).

Damour (1853): 3: 179 (as Roméine).

Bertrand (1881) Bulletin de la Société française de Minéralogie: 4: 237.

Hussak and Prior (1895) Mineralogical Magazine: 11: 80.

Sjögren (1895) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 17: 313.

Hussak (1905) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 240.

Lacroix, A. (1910) Minéralogie de la France et des ses colonies, Paris. 5 volumes: vol. 4: 360.

Goldschmidt, V. (1913) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 1: 1: 121 (atopite variety)

Pelloux (1913) Mus. Civ. Storia nat. Genova, Ann.: [3], 6: 22.

Schaller (1916) U.S. Geological Survey Bulletin 610: 81, 95.

Rose (1919) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 268.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 128, 130.

Machatschki (1932) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 73: 159.

Machatschki (1932) Chemie der Erde, Jena: 7: 56.

Machatschki and Zedlitz (1932) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 82: 72.

Zedlitz (1932) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 81: 253.

Aminoff (1933) Ak. Stockholm, Handl.: [3]: 11: 14.

Hintze (1937) Erg.-Bd.: 571.

Pabst (1939) American Mineralogist: 24: 575.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1020-1022.

American Mineralogist (1952): 37: 982-998.

Welin, E. (1968) X-ray powder data for minerals from Långban and the related mineral deposits of Central Sweden. Arkiv Mineral. Geol., 4(30), 499–541.

Dunn, P.J. & Leavens, P.B. (1980) American Mineralogist: 65: 196-199.

Dunn, P.J., et al (1980) American Mineralogist: 65: 1143-1145.

Dunn, Pete J. (1995): Franklin and Sterling Hill New Jersey: the world’s most magnificent mineral deposits, part 4: 604.

Brugger, J., Gieré, R., Graeser, S. and Meisser, N. (1997): Crystal chemistry of roméite. Contributions to Mineralogy and Petrology: 127: 136-146.

Lapis (2000): 25(3): 30-36.

Atencio D., Andrade M.B., Christy A.G., Giere R., Kartashov P.M. (2010): The pyrochlore supergroup of minerals: nomenclature. Canadian Mineralogist, 48, 673-698.

Christy, A. G. and Atencio, D. (2013): Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine, 77, 13-20.

Internet Links for Roméite Group

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  • Specimens:The following Roméite Group specimens are currently listed for sale on minfind.com.

    Localities for Roméite Group

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