A siliceous rock of chalcedonic or opaline silica occurring in limestone.
硅石出现在灰岩中的玉髓或蛋白色硅石
It contains bringht green siliceous grains which are similar to mung beans in form, thus, is called a mung beau rock.
绿豆岩按后生变化结果可分力富钾凝灰岩和绿鳞石粘土岩。
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