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
Fifteen stones have been recognized as GHSR so far: Portland stone (UK), Petit granite (Belgium), Larvikite (Norway), Podpêc limestone (Slovenia), Hallandia gneiss (Sweden), Carrara marble (Italy), Villamayor sandstone (Spain), Estremoz marble (Portugal), Maltese Globigerina Limestone (Malta) , Jacobsville Sandstone (USA), Lede stone (Belgium), Welsh Slate (Wales), Piedra Mar del Plata (Argentina), Kolmården serpentine marble (Sweden), and Lioz (Portugal). Another group of stones is being coordinated at the moment to propose their designation.
The EC also approved a design for ratified Heritage Stone Resources for posters to be placed with local government agencies or communities and for educational purposes. The example is the poster of Villamayor stone, that was handed over to the mayor of the village during the I Workshop on Heritage Stones in Salamanca, October, 2018.
More on the designated stones at:
Estremoz marble at Vienna airport (Picture: Lola Pereira)