appears to be acmv Adhered Manufactured Stone Veneer (AMSV) ? lightweight, architectural, non load-bearing product that is manufactured by wet cast blending cementitious materials and aggregates, with or without pigments, admixtures, or other materials to simulate the appearance of natural stone and other masonry materials. Note: The MVMA recognizes there are many names used to describe Adhered Manufactured Stone Veneer products. Adhered Manufactured Stone Veneer is used commonly throughout the industry and by some manufacturers. In the International Building Code, Adhered Manufactured Stone Veneer products are referred to as Adhered Masonry Veneer. In the ICC-ES Acceptance Criteria, AC51, the product is called Precast Stone Veneer. This guide will use AMSV (Adhered Manufactured Stone Veneer) when referencing the product. http://ncma-br.org/pdfs/masterlibrary/M ... 20Prtg.pdf natural stone veneer or wythe aren't usually smoother cut on the backside finding full or partial loose pieces falling off the structure or adhered to what appears to be an im/proper brown coat stucco application is usually a great clue you're at an acmv install