minerals, ores and crystals, chromolithograph, published ca. 1890 - 黃鐵礦 幅插畫檔、美工圖案、卡通及圖標圖畫 - 藝術品, 隕石, 科學
two specific geological materials—iron pyrites (left) and flint (right) found in the ash layers of ancient cave floors - 黃鐵礦 幅插畫檔、美工圖案、卡通及圖標