Ironstone is a sedimentary rock, either deposited directly as a ferruginous sediment or created by chemical replacement, that contains a substantial proportion of an iron compound from which iron either can be or once was smelted commercially. This term is customarily restricted to hard coarsely banded, nonbanded, and noncherty sedimentary rocks of post-Precambrian age.
例句与用法
1.
Bring out your floral china or white ironstone , set up a collection of pitchers or glass , and include plants and picture frames as well 拿出你有鲜花图案的瓷器或白色的铁石，摆上一系列的大水罐或玻璃瓶，别忘了植物和相框。
2.
In ma on shan park , there is a mining history display area to present the mining machine , ironstone and related information . you can know more about the development of the mining in hong kong 为了介绍这段历史，公园中设有一个马鞍山采矿历史的展览场地，展出当年矿场的资料、机器和矿石，让大家对本港矿业的发展有更深的了解。
您当前位置：