marcasite
noun
mar·ca·site
| \ ˈmär-kə-ˌsīt
, -ˌzīt; ˌmär-kə-ˈzēt\
, -ˌzīt; ˌmär-kə-ˈzēt\
Definition of marcasite
1a
: crystallized pyrite
b
: a pale yellow to white mineral of the same composition and appearance as pyrite but of different crystalline organization and lower specific gravity
2
: a piece of marcasite used in jewelry
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