Lapis-lazuli or Lazuli. A mineral of a fine azure-blue color, usually occurring in small rounded masses. It is essentially a silicate of alumina, lime, and soda, with some sodium sulphide. It is often marked by yellow spots or veins of sulphide of iron, and is much valued for ornamental work.
“Walk as on the borders of the invisible world.”
–Robert Hawker Poor Man's Morning and Evening Portions, July 17