Roncari Quarry, East Granby, Hartford County, Connecticut, USA
Stilpnomelane is a rare and complex hydrated silicate which was named in 1827. Its name literally translates to “shining black”, however Roncari Quarry in Connecticut produced tiny amounts of golden tan stilpnomelane. Only a few specimen were recovered from this quarry and most are a small dusting on quartz. This is a large plate with prismatic quartz crystals completely covered with the rare stilpnomelane. This piece was in the collection of Phil Scalisi and is a remarkable specimen of a rare mineral from a famous locality.
Ex Phil Scalisi
4.50 x 12.00 x 7.50 cm