Natural Welo Opal from Ethiopia | #Geology #GeologyPage #WeloOpal #Opal #Ethiopia Many of the opals mined in Ethiopia are hydrophane opals, particularly from the Welo rocks. Hydrophane Opal is a fresh word designed to define a specific Opal form. Ethiopian opal is one of today’s most varied and spectacular opal types on the market. Because this type of opal is new, there is no industry-accepted way of grading this type of opal like the black opal. Black opal is in darkness, color brightness and