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As early as the 7th millennium BC, lapis lazuli was mined in the Sar-i Sang mines,[55] in Shortugai, and in other mines in Badakhshan province in northeast Afghanistan.[56] Lapis lazuli artifacts, dated to 7570 BC, have been found at Bhirrana, which is the oldest site of Indus Valley civilisation.[57] Lapis was highly valued by the Indus Valley Civilisation (7570–1900 BC).[57][58][59] Lapis beads have been found at Neolithic burials in Mehrgarh, the Caucasus, and as far away as Mauritania.[60] It was used in the funeral mask of Tutankhamun (1341–1323 BC).[61] A term for Blue was relatively rare in many forms of ancient art and decoration, and even in ancient literature. The Ancient Greek poets described the sea as green, brown or "the colour of wine". The colour is mentioned several time
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