Porphyry, a volcanic rock
Trentino porphyry, a primary stratified effusive volcanic rock, dates back 270 million years and consists of a very compact underlying vitreous mass containing quartz crystals that give the products a number of outstanding physical and mechanical characteristics able...Glossary
Alignment The placing of one or more rows of blocks in line. Anchoring Attaching the elements to the load bearing structure. Assistance The supply of accessories for laying, usually supplied by the construction company: removal and dumping of waste material,...