
Arsenical cobalt or skutterudite, from Skutterude, near Modum, Norway
before 1889
before 1889
1870s
2013
1970
1500-1599
1940s-1950s
1950s
1950s
1950s
1950s
1950s
2015-2020
1800-1883
1880-1894
1870s
1872-3
1880-1900
1964-01-18
1964-10-18
1780
1950s
1950s
1850-1900
1850-1900
1960-1985
Unknown
circa 1970
1911
1992
1992
1950-1970
1992
1684
1992-06
1800-1883
1987-1993
1987-1993
1952
2015-2020
1992
1992
1992
1981-1990