
Arsenical cobalt or skutterudite, from Skutterude, near Modum, Norway
before 1889
before 1889
1870s
2013
1950s
1950s
1950s
1940s-1950s
1950s
1950s
1800-1883
1880-1894
1970
1880-1900
1870s
1872-3
1500-1599
2015-2020
1964-01-18
1964-10-18
1950s
1950s
1780
1911
1850-1900
1850-1900
1960-1985
Unknown
circa 1970
1950-1970
1992-06
1952
1992
1684
1992
1987-1993
1987-1993
1800-1883
1992
2015-2020
1801-1900
1800-1883
1872
1992