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

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(Île de Rouma, Archipel de Los, Guinée)

Nepheline syenite with pegmatites.




References:
LACROIX, A. (1908) Sur l'existance du fluorure de sodium cristallisé comme èlèment des syènites nèphèliniques des Îles de Los. Comptes
Rendu, Academie des Sciences, Paris. 146, No.5. 213-216.
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
(in French).
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.
MOREAU, C. et al. (1996) Can. Min. 34,281-299.
Parodi, G. C., & Della Ventura, G. (1987). Steacyite from the Rouma Isle (Los Islands, Republic of Guinea). Neues Jarbuch fur Mineralogie, Mh., Jg. 1987, H. 5, 233-239





 Map Reference: 9°29'5"N , 13°47'0"W

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Group 2 - Sulphides and Sulfosalts
  		• Galena2.CD.10
    PbS
  		• Molybdenite2.EA.30
    MoS
     
    2
  		• Pyrite2.EB.05a
    FeS
     
    2
  		• Pyrrhotite2.CC.10
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
    Group 3 - Halides
  		• Fluorite3.AB.25
    CaF
     
    2
  		• Villiaumite (TL)3.AA.20
    NaF
    Group 4 - Oxides and Hydroxides
  		• Gibbsite4.FE.10
    Al(OH)
     
    3
  		• Magnetite4.BB.05
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
  		• Pyrochlore4.DH.15
    (Ca,Na)
     
    2
    		Nb
     
    2
    		O
     
    6
    		(OH,F)
  		• Pyrophanite4.CB.05
    Mn
    2+
     
    		TiO
     
    3
    Group 5 - Nitrates and Carbonates
  		• Calcite5.AB.05
    CaCO
     
    3
    Group 8 - Phosphates, Arsenates and Vanadates
  		• Apatite-(CaF)8.BN.05
    Ca
     
    5
    		[F|(PO
     
    4
    		)
     
    3
    		]
    Group 9 - Silicates
  		• Aegirine9.DA.25
    NaFe
    3+
     
    		[Si
     
    2
    		O
     
    6
    		]
  		• Albite9.FA.35
    Na[AlSi
     
    3
    		O
     
    8
    		]
  		• Analcime9.GB.05
    Na
     
    2
    		[Al
     
    2
    		Si
     
    4
    		O
     
    12
    		] · 2H
     
    2
    		O
  		• Arfvedsonite9.DE.25
    [Na][Na
     
    2
    		][Fe
    2+
    4
    		Fe
    3+
     
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Astrophyllite9.DC.05
    (K,Na)
     
    3
    		(Fe,Mn)
     
    7
    		Ti
     
    2
    		Si
     
    8
    		O
     
    24
    		(O,OH)
     
    7
  		• Augite9.DA.15
    (Ca,Na)(Mg,Fe
    2+
     
    		,Al,Fe
    3+
     
    		,Ti)[(Si,Al)
     
    2
    		O
     
    6
    		]
  		• Biotite9..
  		• Cancrinite9.FB.05
    Na
     
    6
    		Ca
     
    2
    		[(CO
     
    3
    		)
     
    2
    		|Al
     
    6
    		Si
     
    6
    		O
     
    24
    		] · 2H
     
    2
    		O
  		• Catapleiite9.CA.15
    Na
     
    2
    		Zr[Si
     
    3
    		O
     
    9
    		]·2H
     
    2
    		O
  		• Eudialyte9.CO.10
    Na
     
    15
    		Ca
     
    6
    		(Fe
    2+
     
    		,Mn
    2+
     
    		)
     
    3
    		Zr
     
    3
    		[Si
     
    25
    		O
     
    73
    		](O,OH,H
     
    2
    		O)
     
    3
    		(OH,Cl)
     
    2
  		• Grossular9.AD.25
    Ca
     
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
  		• Hastingsite9.DE.15
    [Na][Ca
     
    2
    		][Fe
    2+
    4
    		Fe
    3+
     
    		][(OH)
     
    2
    		|Al
     
    2
    		Si
     
    6
    		O
     
    22
    		]
  		• 'Hiortdahlite'9.BE.17
    (Ca,Na)
     
    3
    		(Zr,Ti)Si
     
    2
    		O
     
    7
    		(O,OH,F)
     
    2
  		• Kupletskite9.DC.05
    (K,Na)
     
    3
    		(Mn,Fe)
     
    7
    		Ti
     
    2
    		Si
     
    8
    		O
     
    26
    		(OH)
     
    4
    		F
  		• Leucophanite9.DH.05
    NaCaBeSi
     
    2
    		O
     
    6
    		F
  		• Låvenite9.BE.17
    (Na,Ca)
     
    2
    		(Mn
    2+
     
    		,Fe
    2+
     
    		)(Zr,Ti)[(O,OH,F)
     
    2
    		|Si
     
    2
    		O
     
    7
    		]
  		• Microcline9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Muscovite9.EC.15
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Natrolite9.GA.05
    Na
     
    2
    		[Al
     
    2
    		Si
     
    3
    		O
     
    10
    		] · 2H
     
    2
    		O
  		• Nepheline9.FA.05
    (Na,K)[AlSiO
     
    4
    		]
  		• Rinkite9.00.20
    Ti(Na,Ca)
     
    3
    		(Ca,Ce)
     
    4
    		(Si
     
    2
    		O
     
    7
    		)
     
    2
    		OF
     
    3
  		• Rosenbuschite9.BE.22
    (Ca,Na)
     
    3
    		(Zr,Ti)[O|F|Si
     
    2
    		O
     
    7
    		]
  		• Sodalite9.FB.10
    Na
     
    8
    		[Cl
     
    2
    		|Al
     
    6
    		Si
     
    6
    		O
     
    24
    		]
      var: Hackmanite9.FB.10
    Na
     
    8
    		Al
     
    6
    		Si
     
    6
    		O
     
    24
    		(Cl
     
    2
    		,S)
  		• Steacyite9.CH.10
    ([ ],K)(Na,Ca)
     
    2
    		(Th,U)[Si
     
    8
    		O
     
    20
    		]
  		• Sérandite (TL)9.DG.05
    Na(Mn
    2+
     
    		,Ca)
     
    2
    		[HSi
     
    3
    		O
     
    9
    		]
  		• Titanite9.AG.15
    CaTi[O|SiO
     
    4
    		]
  		• Vishnevite9.FB.05
    (Na,K)
     
    8
    		[(SO
     
    4
    		,CO
     
    3
    		)|Al
     
    6
    		Si
     
    6
    		O
     
    24
    		] · 2H
     
    2
    		O
  		• Wöhlerite9.BE.17
    NaCa
     
    2
    		(Zr,Nb)[(O,OH,F)
     
    2
    		|Si
     
    2
    		O
     
    7
    		]
  		• Zircon9.AD.30
    Zr[SiO
     
    4
    		]
    Unclassified Minerals
  		• 'Albite-Anorthite Series'-
  		• IMA2008-024 (TL)-
    (Ca,Na,REE,[])
     
    7
    		(Nb,Ti)[Si
     
    2
    		O
     
    7
    		]
     
    2
    		OF
     
    3
  		• 'Smectite Group'-
    A
     
    0.3
    		D
     
    2-3
    		[T
     
    4
    		O
     
    10
    		]Z
     
    2
    		·nH
     
    2
    		O


    45 entries listed. 40 valid minerals.

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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 26th Nov 2009 18:37:08