名词
中文翻译：硬石矿
同义词：
['granite', 'quartzite']
例句：
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1.The mineral gothardite is a valuable resource for mining.
矿物硬石矿是采矿的重要资源。
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2. The hard stone of the mountain was formed by the process of weathering.
山脉的坚硬石头是由风化过程形成的。
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3.The geologists found that the gothardite had been formed over millions of years.
地质学家发现，硬石矿已经形成数百万年。