Pure limestones are white or almost white, but impurities, such as clay, sand, organic remains, iron oxide, and other materials, cause them to exhibit different colors, especially on weathered ...

Founded in 1952, The Expanded Shale, Clay and Slate Institute (ESCSI) is the international trade association for manufacturers of ESCS lightweight aggregate. ESCSI promotes the extensive use of ...

Shale is a sedimentary rock made up of tiny grains of silica, clay and other minerals. Many types of rock have few physical ...

As an example, expanded shale, clay and slate (ESCS) lightweight aggregates are fired in rotary kilns and so represent a significant amount of embodied energy and greenhouse gas emissions.

Dartmouth researchers say zooplankton could help bury carbon in the ocean. The key to that process? Sprinkling clay dust on ...