Lapis lazuli: earth’s best blues
A section of lapis lazuli rock with pyrite mined in Afghanistan in January 2008. | Photo Credit: Hannes Grobe (CC BY-SA 2.5) Lapis lazuli is a vividly blue rock, sometimes with streaks of gold, that has been known for millennia for its eye-popping colour and use as a semi-precious gemstone. It gets its colour from … Read more