Biotite is a subordinate constituent of the mafic and ultramafic rocks generally . 黑云母一般是镁铁质及超镁铁质岩石中的次要成分。
The pool, fed by an artesian well with a high iron content, was a pale shade of green . 池水来源于铁质很高的自流井,水面呈现淡淡的绿色。
With regard to the oxide minerals, chromite is almost entirely contained in the olivine-rich ultramafic rocks in the lower part of the intrusion . 关于氧化矿物,铬铁矿几乎全部含于侵入体下部的富橄榄石的超镁铁质岩石中。
Main source of protein and iron in our diet 日常饮食中蛋白质及铁质的主要来源。
Gravelly - sand over an iron - pan and gravel layer 沙砾覆于铁质土层与砂砾层之上。