Silver also occurs as small dyscrasite inclusions in galena.
H. Makkonen, E. Ekdahl 1988, 'Petrology and structure of the early Proterozoic Pirilä gold deposit in southeasternFinland', Bulletin of the Geological Society of Finlandhttp://www.geologinenseura.fi/bulletin/Volume60/sgs_bt_060_1_pages_055_066.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)