LAPIS LAZULI

A RICH BLUE OPAQUE GEMSTONE OFTEN USED IN WATCH DIALS. IT IS SPECKED WITH PYRITE THAT LOOKS LIKE GOLD. LAPIS HAS A HARDNESS OF 5.5; IT HAS A SPECIFIC GRAVITY OF 2.4 TO 2.9. LAPIS LAZULI IS NOT A MINERAL BUT A ROCK THAT CONTAINS THE MINERALS LAZURITE, CALCITE AND HAUYNITE