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marcasite

noun [U]
 
 
/ˈmɑː.kə.saɪt/ US  /ˈmɑːr-/

Definition

a mineral that can be cut and made to look like precious stones and is used to make jewelleryPrecious and semi-precious stonesTypes of rockTypes of rockPrecious and semi-precious stones
(Definition of marcasite noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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