Mineral Specimen #150 Birnessite pseudomorph after Serandite
Mont Saint-Hilaire, Rouville RCM, Monteregie, Quebec, Canada
Na4Mn14O27·9H2O
This specimen is a very unusual pseudomorph of Birnessite after Serandite. The form of the Serandite is well preserved and quite distinct. In places, there is a bronze colored iridescence. The specimen was collected in 1972.