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La Chaux de Bergonne, Gignat, Saint-Germain-Lembron, Puy-de-Dôme, Auvergne, France

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Located 3 km north of Gignat and about 5 km SSW of Issoire, on top of La Chaux de Bergonne plateau.
Cavity fillings in an alkali basalt lava flow.
Sillimanite present as alluvial boulders unrelated to other minerals.




Group 4 - Oxides and Hydroxides
  		• Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
    Group 9 - Silicates
  		• Garronite9.GC.05
    Na
     
    2
    		Ca
     
    5
    		Al
     
    12
    		Si
     
    20
    		O
     
    64
    		·27H
     
    2
    		O
  		• Gonnardite (TL)9.GA.05
    Na
     
    2
    		Ca[Al
     
    2
    		Si
     
    3
    		O
     
    10
    		]
     
    2
    		 · 7H
     
    2
    		O
  		• Natrolite9.GA.05
    Na
     
    2
    		[Al
     
    2
    		Si
     
    3
    		O
     
    10
    		] · 2H
     
    2
    		O
  		• Sillimanite9.AF.05
    Al
     
    2
    		[O|SiO
     
    4
    		]
  		• Thomsonite-Ca9.GA.10
    NaCa
     
    2
    		[Al
     
    5
    		Si
     
    5
    		O
     
    20
    		] · 6H
     
    2
    		O
    Unclassified Minerals
  		• 'Chabazite'-
  		• 'Phillipsite'-
  		• 'Smectite Group'-
    A
     
    0.3
    		D
     
    2-3
    		[T
     
    4
    		O
     
    10
    		]Z
     
    2
    		·nH
     
    2
    		O


    9 entries listed. 6 valid minerals.

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