Siderite, ferrous carbonate, FeCO3. When pure it contains 48.2 % of iron. It varies in colour from pale yellow to brown.是什么意思_Siderite, ferrous carbonate, FeCO3. When pure it contains 48.2 % of iron. It varies in colour from pale yellow to brown.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句