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Rouma Island (Roume Island; Roma Island; Ruma Island), Los Archipelago (Los Islands), Guinea

Villiaumite
Rouma Island, Los Archipelago, Guinea

Photo: 2008, JGW
Latitude: 9°29'5"N
Longitude: 13°47'0"W
Île de Rouma, Archipel de Los, Guinée

Nepheline syenite with pegmatites.


Mineral List

Aegirine
Albite
'Albite-Anorthite Series'
Analcime
Arfvedsonite
Astrophyllite
Augite
'Biotite'
Calcite
Cancrinite
Catapleiite
Eudialyte
Fluorapatite
Fluorite
Galena
Gibbsite
Grossular
Hastingsite
Hiortdahlite
Kupletskite
Låvenite
Leucophanite
Magnetite
Microcline
Molybdenite
Muscovite
Natrolite
Nepheline
Pyrite
Pyrochlore Group
Pyrophanite
Pyrrhotite
Rinkite
Rosenbuschite
Roumaite (TL)
Sérandite (TL)
'Smectite Group'
Sodalite
var: Hackmanite
Steacyite
Titanite
Villiaumite (TL)
Vishnevite
Wöhlerite
Zircon


45 entries listed. 41 valid minerals. 3 type localities (valid minerals).

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References

LACROIX, A. (1908) Sur l'existance du fluorure de sodium cristallisé comme èlèment des syènites nèphèliniques des Îles de Los. Comptes

LACROIX, A. (1911) Les syènites nèphèliniques de l'archipel de Los et leurs minéraux. Nouvelles Archives du Muséum d'Histoire Naturelle (Paris), Série 5., 3, 1-132. (in French)

LACROIX, A. (1912) Les syènites nèphèliniques de l'archipel de Los (Guinèe) Bulletin de la Société Française de Minéralogie, 35, 5-44

LACROIX, A. (1931) Les pegmatites de la syènite sodalitique de l'Îsle Rouma (Archipel de Los, Guinèe française). Desciption d'un nouveau minéral (sérandite) qu'elles renferment. Comptes Rendu, Academie des Sciences, Paris. 192, No.4. 187-194. (in French). English abstract: American Mineralogist, 16, (1931) 344.

Parodi, G. C., & Della Ventura, G. (1987): Steacyite from the Rouma Isle (Los Islands, Republic of Guinea). Neues Jahrbuch fur Mineralogie, Mh., 1987, 233-239.

MOREAU, C. et al. (1996): Can. Mineral. 34, 281-299.

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.

(in French).

Rendu, Academie des Sciences, Paris. 146, No.5. 213-216.

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