Bertrandite : Be4(Si2O7)(OH)2
Clinochlore : Mg5Al(AlSi3O10)(OH)8
As recorded:
Gischi glacier, Binn, Goms, Valais, Switzerland
Photo added to mindat.org
“Image width 4 mm.
Bertrandite with black Clinochlore. Found by Ate van de Burgt on 23-09-2007.”
Edward Antonysen - 12th July 2013
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