Mineral: | Opal (hydrated amorphous Silica, Cristobalite, Tridymite)
| Chemical Formula: | SiO2� nH2O | Size: | 30,0 x 33,2 x 20,2 & 15,8 x 15,5 x 14,7 mm | Weight: | | Transparence: | transparent - translucent | Quantity: | | Origin: | Yita Ridge, in the Menz Gishe District of Shewa Province, around 240 km northeast of Addis Ababa, Ethiopia | Here you get a nodule and two rough Opal pieces from Ethiopia with a fine color play ranging from green, red orangey up to bluish light reflexes. The two rough pieces are quite transparent and display a fine color play allover the surface.
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