Arsenical cobalt or skutterudite, from Skutterude, near Modum, Norway
before 1889
before 1889
1870s
2013
1950s
1950s
1950s
1940s-1950s
1950s
1950s
1970
1500-1599
1870s
1872-3
1880-1900
1880-1894
1800-1883
1950s
1950s
1960-1985
1850-1900
1850-1900
1874-1895
1911
circa 1970
1780
1964-01-18
1964-10-18
2015-2020
1992
1992
1952
1992-06
1987-1993
1987-1993
2015-2020
1992
1684
1950-1970
1800-1883
1992
1992
1992
1992
1981-1990