gypsum

Additionally, the basin was filled with layers of salt and gypsum.

The best remedy for high pH, Wallace said, is to add gypsum to your soil and avoid things that can make the soil more alkaline, such as crushed concrete.

The underground road leading down to where the gypsum is extracted is steep and with sharp bends.

A runaway freighter full of gypsum rammed a steel bridge, but the cause was crew inattention, not mechanical like Baltimore.

White Sands National Park, about an hour’s drive from Las Cruces and four hours from the capital, lets you wander 250-plus square miles of white gypsum sand dunes on foot or by bike — year-round.