Azurite, a naturally occurring copper carbonate mineral, has been a blue pigment for thousands of years, particularly in medieval Europe, where it was a more affordable alternative to ultramarine made from lapis lazuli.
Related Posts
Whatever Happened to Acid Rain? The 1980s Crisis We Actually Solved
Acid rain has not disappeared—it declined because of coordinated action, offering a rare environmental success story that still needs vigilance to maintain.
Where Are All the Coastal Observatories?
While islands and beaches offer low light pollution and clear skies, they are unsuitable for professional astrophysics observatories…
Can aching joints really predict the weather? Exploring the science behind the stormy debate
Michelle Spear, University of Bristol For centuries, people have claimed that their aching joints can predict changes in…
What could we do to cool the Arctic, specifically?
titoOnz / shutterstock / NASA Shaun Fitzgerald, University of Cambridge and Hugh Hunt, University of Cambridge The Arctic…