gemology, sard a translucent, deep reddish-brown to brownish-red variety of chalcedony quartz, vintage illustration - 石英閃綠岩 幅插畫檔、美工圖案、卡通及圖標
minerals and rocks ,almond stone structure of melaphyre (ilfeld, thuringia, germany) - 石英閃綠岩 幅插畫檔、美工圖案、卡通及圖標