標 本 名: | Opal (hydrated amorphous Silica, Cristobalite, Tridymite)
| 化学組成: | SiO2ﾷ nH2O | サ イ ズ : | 30,0 x 33,2 x 20,2 & 15,8 x 15,5 x 14,7 mm | 重量: | | 透明: | transparent - translucent | 数量 : | | 産地: | 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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