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Specific Gravity:
3.33 (Calculated)
Crystal System:
For the type locality.
This page provides mineralogical data about Roumaite.

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Classification of RoumaiteHide

Approval Year:

Physical Properties of RoumaiteHide

3.33 g/cm3 (Calculated)

Chemical Properties of RoumaiteHide

IMA Formula:

Crystallography of RoumaiteHide

Crystal System:
Class (H-M):
m - Domatic
Space Group:
Cell Parameters:
a = 7.473 Å, b = 11.294 Å, c = 18.778 Å
β = 101.60°
a:b:c = 0.662 : 1 : 1.663
Unit Cell V:
1,552.49 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
3.057 (100)
2.790 (40)
2.689 (46)
2.567 (44)
2.021 (68)
2.004 (33)
1.813 (33)
1.680 (60)

Type Occurrence of RoumaiteHide

General Appearance of Type Material:
very small acicular crystals.
Place of Conservation of Type Material:
Museum National d'Histoire Naturelle, 61, rue Buffon, F-75005 Paris, France, catalogue # MNHN208.1; cotype material is deposited in the mineralogical collection of Museo di Storia Naturale e del Territorio, Universita di Pisa, Via Roma 79, Calci (PI), Ita
Geological Setting of Type Material:
a late-stage product of hydrothermal activity in the cavities of nepheline syenites.
Associated Minerals at Type Locality:

Synonyms of RoumaiteHide

Relationship of Roumaite to other SpeciesHide

Other Members of this group:
Batievaite-(Y)Y2Ca2Ti(Si2O7)2(OH)2(H2O)4Tric. 1 : P1
Fogoite-(Y)Na3Ca2Y2Ti(Si2O7)2OF3Tric. 1 : P1
GötzeniteNaCa6Ti(Si2O7)2OF3Tric. 1 : P1
GrenmariteNa4MnZr3(Si2O7)2O2F2Mon. 2/m : P2/b
Hainite-(Y)Na2Ca4(Y,REE)Ti(Si2O7)2OF3Tric. 1 : P1
KochiteNa3Ca2MnZrTi(Si2O7)2OF3Tric. 1 : P1
Mosandrite-(Ce)(Ca3REE)[(H2O)2Ca0.50.5]Ti(Si2O7)2(OH)2(H2O)2Mon. 2/m : P21/b
Nacareniobsite-(Ce)NbNa3Ca3(Ce,REE )(Si2O7)2OF3Mon.
Rinkite-(Y)Na2Ca4YTi(Si2O7)2OF3Mon. 2/m : P21/b
RosenbuschiteNa6Ca6Zr3Ti(Si2O7)4O2F6Tric. 1 : P1
Structurally related to group(s):

Fluorescence of RoumaiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for RoumaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Biagioni, C., Bonaccorsi, E., Merlino, S., Parodi, G.C., Perchiazzi, N., Chevrier, V., Bersani, D. (2010) Roumaite, (Ca,Na,)3(Ca,REE,Na)4(Nb,Ti)[Si2O7]2(OH)F3, from Rouma Island, Los Archipelago, Guinea: a new mineral species related to dovyrenite. The Canadian Mineralogist, 48, 17-28.

Internet Links for RoumaiteHide

Localities for RoumaiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Guinea (TL)
  • Los Archipelago (Los Islands)
Biagioni, C., Bonaccorsi, E., Merlino, S., Parodi, G.C., Perchiazzi, N., Chevrier, V. & Bersani, D. (2010). Roumaite, (Ca,Na,)3(Ca,REE,Na)4(Nb,Ti)[Si2O7]2(OH)F3, from Rouma Island, Los Archipelago, Guinea: a new mineral species related to dovyrenite. Canadian Mineralogist, 48, 17-28.
Mineral and/or Locality  
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