It is soapstone. I found on their web site. There is another view with the following caption:

The remodeling of 1980’s kitchen maintained the floor plans while creating visual interest. The cabinetry includes high glass cupboards to house special curios and allows for an easy, elegant transition into the contiguous family room. Surfaces such as the soap stone counter surrounding the farm sink and the wooden dining bar, were selected to accommodate the preferences of an active cook.