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 stones achieved the designation as GHSR
Eight stones have been recognized as GHSR so far: Portland stone, Petit granite, Larvikite, Podpêc limestone, Hallandia gneiss, Carrara marble,Villamayor sandstone, Lede stone and Estremoz marble. Another more is in the final process of recognition: Lede stone.
Estremoz marble at Vienna airport (Picture: Lola Pereira)