Assertion: ore's mineral | /r/HasProperty | known since ancient times
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Source sentences:
text: The mineral, a carbonate with the chemical formula Cu 3 (CO 3 ) 2 (OH) 2 , has been known since ancient times, and was mentioned in Pliny the Elder's Natural History under the Greek name kuanos (κυανός: "deep blue", root of English cyan) and the Latin name caeruleum.