The main goal of IGCP-637 was to build a standard to recognize stones that have been used for centuries to build the architectonic heritage of world sites, some of them recognized as World Heritage sites by UNESCO.
The standard was approved by the IUGS Executive Committee in December 2017, and the first six stones achieved the designation as GHSR
Six stones have been recognized as GHSR so far: Portland stone, Petit granite, Larvikite, Podpêc limestone, Hallandia gneiss and Carrara marble. Three more are in the final process of recognition: Villamayor sandstone, Lede stone and Estremoz marble.
Estremoz marble at Vienna airport (Picture: Lola Pereira)