marcasite
noun
mar·ca·site
ˈmär-kə-ˌsīt
-ˌzīt;
ˌmär-kə-ˈzēt
1
a
: 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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Merriam-Webster unabridged
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