All-natural Ethiopian Opal consist 3 % – 21 % water, it can be found in the group of mineraloid. In the early 1990s a brand-new kind of opal appeared in Ethiopia, which was brownish product in nodule. During year 2008 opal from Wollo was discovered. Ethiopian fire opals have striking pattern developments which make each opal unique. Some opals have varied play of different colors from Neon reds, oranges, eco-friendly, blue, white, yellow, brownish and also a fire different colors. Some Ethiopian opal has points displaying spooky colors. There are likewise some "rainbow" opals, where each spots of play-of-color display screen the entire rainbow of spooky shades. Some Ethiopian opal has number patterns, others has fossilized plants in them. Mohs hardness 5.5 – 6.5