目的：分析菱壳粉末中挥发性成分。
Objective: To analyze the constituents of essential oil from the skin of water caltrop.
菱铁矿等含铁碳酸盐在风化作用中向褐铁矿转化；在古风化壳中褐铁矿变为赤铁矿。
Under weathering carbonates, such as siderite are usually turned into limonite which finally occur as hematite in the Weathering crusts.
菱铁矿等含铁碳酸盐在风化作用中向褐铁矿转化；在古风化壳中褐铁矿变为赤铁矿。
Under weathering carbonates, such as siderite are usually turned into limonite which finally occur as hematite in the Weathering crusts.
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