The Blue Once Worth its Weight in Gold | BBC Earth Science

What makes ultramarine so vibrant? The answer lies in the unique chemistry of lapis lazuli. Deep within this rare Afghan stone, sulphur atoms interact with surrounding minerals to create one of the most distinctive blue pigments ever discovered. Best of Earth Science: http://bit.ly/EarthLabOriginals Best of BBC Earth: http://bit.ly/TheBestOfBBCEarthVideos This is a channel from BBC Studios who help fund new BBC programmes. Service information and feedback: http://bbcworldwide.com/vod-feedback--contact-details.aspx