Berthierine : (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
As recorded:
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
Photo added to mindat.org
“Picture width 3 mm. Collection and photograph Stephan Wolfsried”
Stephan Wolfsried - 2nd July 2005
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