CalStar.
Made with fly ash, water, and sand and manufactured with a vibro-compaction process and cured for less time and at a lower temperature, CalStar bricks generate 85% less CO2 and use 85% less energy in production than traditional fired clay, the company says. The bricks incorporate 40% recycled content. A range of colors is available. 510.793.9500. www.calstarproducts.com.