渭北奥陶系的放射虫燧石岩是在稳定的华北地台上形成的远洋沉积。
The radiolarian cherts in the Wenbei region of Shaanxi Province are a formation of pelagic sediments formed within the North China Platform.
矽质岩包括燧石和沈积石英岩，呈薄层状产出，沈积石英岩具鲕状、砾状结构。
The thin-beded siliceous -rocks include chert and depositional quartz with textures of oolite and pebble.
本文介绍了天然金刚石、天然刚玉、石榴石、石英、燧石、浮岩、硅藻土、赤铁矿、珍珠岩等天然磨料的性能特点和其应用。
This paper discusses the performance and application of natural abrasive such as diamond, corundum, garnet, quartz, flint, pumice, diatomite, hematite and perlite.
太原群灰岩中的燧石结核或条带是在成岩作用阶段经硅质交代成因的。
In limestone of Taiyuan Group, Origin of nodular chert and banded chert is that they had been replaced in diagenesis phase.
太原群灰岩中的燧石结核或条带是在成岩作用阶段经硅质交代成因的。
In limestone of Taiyuan Group, Origin of nodular chert and banded chert is that they had been replaced in diagenesis phase.
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