Testing has taken place in the Columbia River Basalts, extensive deposits in Washington and Oregon in the US. India, which has many polluting coal power plants, has huge basalt deposits in the Deccan Traps
.http://www.theguardian.com/environment/2016/jun/09/co2-turned-into-stone-in-iceland-in-climate-change-breakthrough
.http://www.theguardian.com/environment/2016/jun/09/co2-turned-into-stone-in-iceland-in-climate-change-breakthrough