The movement of groundwater through the limestone has caused formation of chert nodules. The chert is composed of silicon dioxide and is gray or whitish-gray. It forms small round or ellipitical ...

Knowing the type of aggregate in the concrete or asphalt to be cut influences the performance and selection of diamond blades and drill ... 3 Calcite (soft limestone), 4 Fluorite, 5 Apatite ...

Show an experienced Pleistocene archaeologist a chert blade, and they can probably tell ... along with an ocher-smeared limestone slab and a battered cobblestone hammer, lying at the center ...

The shredded fiberglass from a seven-ton windmill blade replaces several tons of raw material such as coal, silica, limestone and other mineral-based raw materials. Another company, Global ...

They are made on small fine-grained chert blades, some of which were probably imported, and some of them are in quartzite," Cressard said. The archaeologist added that the debitage of small fine ...