Opals, as hydrated forms of silica, encompass a wide range of materials formed by both biogenic and diagenetic processes. The genesis of opal involves precipitation from silica‐rich fluids and ...

There’s something special about opals — several things, to be exact. Every opal is unique due to variations in flashes of color and patterns. And the shade of the opal can change based on the lighting ...

Sources indicate that in the early 1990s opal, a typical gemstone surfaced in Mezezo, North Shoa Zone of Amhara State. The type of gem was called Chocolate opal because of the chocolate colour inside ...