1.【矿】燧石,黑硅石
1.a brittle microcrystalline quartz.
1.Minor amounts of dolomite, chert and clay are common in limestones. Chalk is a form of fine-grained limestone.
石灰岩内常有少量的白云石、燧石及粘土，白垩是一种细粒的石灰岩。
2.Radiolarian chert, as an important environmental indicator, is widespread in South China and adjacent areas.
放射虫矽质岩在中国南方及邻区广泛分布，有重要的古地理意义。
3.The sedimentary environment of the chert reflects the tectonic setting of the small oceanic basin in Late Jurassic.
硅质岩的形成环境反映了该陆缘小洋盆在晚侏罗世所处的构造背景。
4.Chert with good abrasion is the major content in conglomerate, and diamonds are contained in it generally.
砾岩主要砾石成分为燧石，磨圆度较好，普遍含金刚石。
5.The Anasazi made arrowheads by chipping away at pieces of glassy obsidian (black) and chert (grey and red) until they became sharp.
古阿纳萨齐人通过细细地打磨黑曜石和黑硅石使它们变的锋利，最后制作出箭头来。
6.The cardium sandstone is lithic, being composed of grains of chert, quartz, quartzite, silicified argillite , and other rock fragments.
卡迪砂岩是岩屑砂岩，由燧石，石英、石英岩、硅化泥板岩和其它岩石碎屑颗粒所组成。
7.In the Daba-Xiugugabu ophiolite belt of southwestern Tibet, there exists widely distributed Mesozoic chert associated with ophiolite.
西藏西南部达巴—休古嘎布存在一条蛇绿岩带，与蛇绿岩伴生的中生界硅质岩分布广泛。
8.to rounded quartz with only an occasional chert or limonite grain.
以圆形石英只是偶尔燧石或褐铁矿粮食。
9.This valued rock, often chert or obsidian. . .
这是很有价值的石块，如黑耀石或者燧石…
10.They're always made from local chert .
它们都是当地黑燧石制成的。