Quartz is used for countertops in millions of homes around the world — the manmade stone is popular for its beauty and durability. But for workers who make, cut and install quartz counters, it can be deadly. The World reported from Turkey, Spain and Australia — three stops along the quartz countertop supply chain — to learn more about silicosis, an incurable and often fatal lung disease caused by inhaling dust laden with excessive amounts of a mineral called silica.

Each worker received a filtered face mask every six months. But one by one, Girgin’s coworkers still fell ill with silicosis—a lung disease caused by breathing in dust from silica-laden materials. The immune system typically produces mucus as a protective measure, but eventually, the mucus clogs the lungs, which inevitably leads to suffocation.

Growing up in Çine, Girgin saw a neighbor get sick and die within a year.

There is no cure for silicosis.