De Kalb Township, St. Lawrence County, New York, USA
Specimen on left is about 4 cm long. Harvard Mineralogical Museum nos. 117536, 117537. Ex - NY State Museum specimens. P. Cristofono photo.
© 2007 Peter Cristofono
Cuchillo Negro Mining District, Sierra Cuchillo, Sierra County, New Mexico, USA
Black metallic geerite. Associated minerals, not in the photograph, include, sphalerite and chalcopyrite. Acquired from e-shop-minerals. Brent Thorne specimen and photograph.
© Brent Thorne 2017
Metallic black Geerite Photo with Canon Eos 600D + Bellows + Rodenstock Rodagon 50mm 1:4,0 reversed Photo and collection Giovanni Scapin
© 2021 Giovanni Scapin