A&G Marble is a dealer in various brands of engineered quartzs.
Caesarstone: http://www.caesarstoneus.com/
Silestone: http://www.silestoneusa.com/
Dupont Zodiaq: http://www2.dupont.com/Surfaces/en_US/products/zodiaq/index.html
IceStone: http://www.icestone.biz/

A&G is member of the following associations.
MIA(Marble Institute of America): http://www.marble-institute.com/
BSI(Building Stone Institute): http://www.buildingstoneinstitute.org/