While investigating hackmanite, researchers found that it can change color upon exposure to UV radiation repeatedly without wearing out. The results show that the inexpensive hackmanite, which is easy ...

While investigating hackmanite, a natural wonder material, researchers found that it, in addition to two other minerals, can change their color upon exposure to UV radiation repeatedly without wearing ...

Mineral pigments once held the dominant position in Chinese painting. Cliff paintings from the Neolithic Age in Cangyuan, Yunnan Province, and mineral-color paintings on the site of the imperial ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Collectors prize the copper mineral linarite for its intense blue color, but specimens with ...

Christian Lacroix’s “Gold-Gotha” ensemble and reliquary cross boasts a riot of gemstones. It’s on display at the Metropolitan Museum of Art in New York until October. Others are often clear. Quartz, ...