Assertion: metal's form | /r/HasProperty | an alloy of copper and zinc
Facets:
Source sentences:
text: Forms of brass, an alloy of copper and zinc made by concurrently smelting the ores of these metals, originate from this period (although pure zinc was not isolated until the 13th century).
text: Forms of brass, an alloy of copper and zinc made by concurrently smelting the ores of these metals, originate from this period (although pure zinc was not isolated until the 13th century).