Lazurite: Chemistry in its element

Published: Feb. 15, 2019, 3:27 p.m.

A brilliant rich blue rock, prized in antiquity as a gemstone and a prominent pigment, lazurite is the basis of lapis lazuli, the original ultramarine paint and \u2013 as Brian Clegg finds \u2013 it even adorns Tutankhamun's death mask.