what is ethiopian opal
Ethiopian Welo opal is a new type of opal found in 2008 in the Welo region of Ethiopia. It is considered to be the most stable kind of opal found in Africa so far.atrix opal is a type of boulder opal that is found diffused throughout the host rock. Some types of matrix opals are treated with black carbon to enhance color. Fire opal. Fire opal is a term commonly used to describe opals which display a significant amount of red coloring.