Wolf, Ron2025-02-252025-02-25https://hdl.handle.net/11124/179616Photographed by Ron Wolf.Prisms of glassy whie calcite on small metallic brassy crystals of marcasite.born digitaldigital photographsCopyright Ron Wolf.In copyright - non-commercial use permitted: http://rightsstatements.org/vocab/InC-NC/1.0/mineral and rock specimensMinerals -- Mexico -- GuanajuatoCalcite -- Mexico -- GuanajuatoMarcasite -- Mexico -- GuanajuatoCrystalsImage