(Table 1, page 215) Chemical composition Mn deposits from the Middle Jurassic...
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The X-ray diffraction analyzes of two ferromanganese crust samples found at the base of the Klaus red Jurassic limestone beds of the Unterberg formation indicate pyrolusite as...
对采自翁贝格组（Unterberg formation）克劳斯侏罗纪红色石灰岩床底部的两件铁锰结壳样品开展的X射线衍射（X-ray diffraction）分析表明，软锰矿（pyrolusite）为……
