Hydrocalumite

  
Fine white crust to tiny, micro acicular crystals no larger than 0.1 mm throughout matrix.
Origin: Boissejour, Ceyrat, Auvergne, France
Ex. Eaton Collection
Sample size: 6 x 6 x 4 cm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

Colourless crystals with afwillite lining cavities in matrix
Origin: Boisséjour near Ceyrat, Puy-de Dome, France
Sample size: 4 x 4.5 cm
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

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