Chert切特
Chert is a sedimentary rock in the class known as chemical sedimentary rocks. It is composed of microcrystalline quartz. 石英岩是一种化学沉积岩类的沉积岩，由微晶石英组成。
Chert is very hard and compact. A number of other rock names are applied to varieties of chert. Flint is dark-colored chert that contains organic matter to contribute the dark color. Jasper is a red variety, deriving its color from iron oxide. Chert occurs in banded forms that are commonly called agate. 石英是一种非常坚硬且致密的岩石。许多其他岩石名称都用于描述石英的不同种类。燧石是一种含有机质的黑色石英，有机质使其呈现黑色。 Jasper 是一种红色的石英，其颜色来源于氧化铁。石英常以带状形式出现，通常被称为玉髓。
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Index Reference Lutgens and Tarbuck Ch 6 索引 参考 Lutgens 和 Tarbuck 第6章 | |||||||||||||||||
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