Additionally, the phenomenon of opal whitening, particularly in Ethiopian fire opals, was investigated. Researchers proposed that the unique zoned opals found in Ethiopia are a result of ...

Tucked beneath the back of the stairs at the Ramada by Wyndham Tucson, 777 W. Cushing Street, Eritrean-born Huruy Zerzghi ...

Some natural opals, mostly from Ethiopia, show a macroscopic finger-like structure called a digit pattern. This pattern consists of vertical columns that are more or less parallel, separated by a ...