Idaite was found in microscopic lamellae within bomite from the old mine dumps at Konnerud near Drammen in the Oslo Region.
During an excursion in July 1964 with the Institute of Mineralogy and Petrography, Mining Academy Clausthal-Zellerfeld/Germany, the old mine dumps from Konnerud were visited under the guidance of Prof. Dr. Chr. Oftedahl. Many samples were taken from the extensive dumps and studied microscopically. Among the minerals identified was the somewhat rare copper-iron sulphide, idaite, a brief description of which follows below.