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Rio Graia, Trontano, Vigezzo Valley, Ossola Valley, Verbano-Cusio-Ossola Province, Piedmont, Italy

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(Rio Graia, Trontano, Val Vigezzo, Val d'Ossola, Verbano-Cusio-Ossola, Piemonte, Italia)

Rio Graia pegmatite is famous for its large beryl xls, up to 10 cm long, and also for some rare species such as ferrotapiolite.

References:
- Boscardin, M.; Mattioli, G. & Pierini, C. (1982): Mikrolith und Columbite. LAPIS 7 (3), 17-19 [ with analysis of 2 columbites from Rio Graia]
- Callegari, A. & Vanini, F. (2002): La fersmite della pegmatite di Rio Graia. Rivista Mineralogica Italiana, 4/2002, 212-215.
- Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.




Group 2 - Sulphides and Sulfosalts
  		• Arsenopyrite2.EB.20
    FeAsS - (Fe
     
    0.90
    		Co
     
    0.10
    		)AsS
    Group 4 - Oxides and Hydroxides
  		• Euxenite-(Y)4.DG.05
    (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)
     
    2
    		O
     
    6
  		• Fersmite4.DG.05
    (Ca,Ce,Na)(Nb,Ta,Ti)
     
    2
    		(O,OH,F)
     
    6
  		• Microlite4.DH.15
    (Ca,Na)
     
    2
    		Ta
     
    2
    		O
     
    6
    		(O,OH,F)
  		• Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
  		• Pyrochlore4.DH.15
    (Ca,Na)
     
    2
    		Nb
     
    2
    		O
     
    6
    		(OH,F)
  		• Quartz4.DA.05
    SiO
     
    2
  		• Samarskite-(Y)4.DB.25
    (Y,Fe
    3+
     
    		,Fe
    2+
     
    		,U,Th,Ca)
     
    2
    		(Nb,Ta)
     
    2
    		O
     
    8
  		• Tanteuxenite-(Y) ?4.DG.05
    (Y,Ce,Ca)(Ta,Nb,Ti)
     
    2
    		(O,OH)
     
    6
  		• Tapiolite-(Fe)4.DB.10
    (Fe,Mn)(Ta,Nb)
     
    2
    		O
     
    6
  		• Uraninite4.DL.05
    UO
     
    2
  		• Uranmicrolite4.DH.15
    (U,Ca,Ce)
     
    2
    		(Ta,Nb)
     
    2
    		O
     
    6
    		(OH,F)
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• Fergusonite-(Y)7.GA.05
    YNbO
     
    4
    Group 8 - Phosphates, Arsenates and Vanadates
  		• Autunite8.EB.05
    Ca(UO
     
    2
    		)
     
    2
    		(PO
     
    4
    		)
     
    2
    		·11H
     
    2
    		O
  		• Monazite-(Ce)8.AD.50
    (Ce,La,Nd,Th)PO
     
    4
  		• Phosphuranylite8.EC.10
    (H
     
    3
    		O)
     
    3
    		KCa(UO
     
    2
    		)
     
    7
    		[O|PO
     
    4
    		]
     
    4
    		 · 8H
     
    2
    		O
  		• Xenotime-(Y)8.AD.35
    YPO
     
    4
    Group 9 - Silicates
  		• 'Adularia'9.FA.30
    KAlSi
     
    3
    		O
     
    8
  		• Bavenite9.DF.25
    Ca
     
    4
    		Be
     
    2
    		Al
     
    2
    		Si
     
    9
    		O
     
    26
    		(OH)
     
    2
  		• Beryl9.CJ.05
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
  		• Clinozoisite9.BG.05
    {Ca
     
    2
    		}{Al
     
    3
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
  		• Kaolinite9.ED.05
    Al
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
  		• Laumontite9.GB.10
    CaAl
     
    2
    		Si
     
    4
    		O
     
    12
    		·4H
     
    2
    		O
  		• Microcline9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Muscovite9.EC.15
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Orthoclase9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Uranophane9.AK.15
    Ca(UO
     
    2
    		)
     
    2
    		[HSiO
     
    4
    		]
     
    2
    		 · 5H
     
    2
    		O
  		• Zircon9.AD.30
    Zr[SiO
     
    4
    		]
    Unclassified Minerals
  		• 'Allanite'-
  		• Columbite-
    (Fe,Mn)(Nb,Ta)
     
    2
    		O
     
    6
  		• Tantalite-
    (Fe,Mn)(Ta,Nb)
     
    2
    		O
     
    6
  		• 'Tapiolite'-
    (Fe,Mn)(Ta,Nb)
     
    2
    		O
     
    6
  		• 'Tourmaline'-
    AD
     
    3
    		G
     
    6
    		(BO
     
    3
    		)
     
    3
    		[T
     
    6
    		O
     
    18
    		]Y
     
    3
    		Z


    33 entries listed. 27 valid minerals.

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