by Soil Mender
A long lasting soil amendment made from clay or shale that has been mined, crushed, and fired to become a light, porous ceramic aggregate. It is used to improve soil aeration and drainage, and remains inert in the soil.
Green Roof, Land Restoration
Example of this material in action:
The Green at College Park at The University of Texas at Arlington, Schrickel and Rollins Associates (Landscape architect), Northstar Construction (General contractor), 2011