The subtle sheen Lydia makes this a uniquely beautiful storage container. Lydiarock, also known as volcanic glass, is formed as molten lava cools. The result is a dense, glossy rock with subtle banding and luster. This luxe storage container is crafted of beautifully nuanced, deep Lydiarock - also known as volcanic glass. The burled patterns and lustrous effects occur as molten lava cools and transforms into a dense, glossy rock.