עפרת , Exodus 15:10; Numbers 31:22; Job 19:24; Jeremiah 6:29; Ezekiel 22:18; Ezekiel 27:12; Zechariah 5:7-8; a mineral of a bluish white colour. It is the softest next to gold, but has no great tenacity, and is not in the least sonorous. It is mentioned with five other species of metal, Numbers 31:22; and there is no doubt but that this is the meaning of the word; so the Septuagint render it throughout, μολιβδος or μολιβος .