White slab with many black inclusions

My wife and I saw white slabs with many black sliver type inclusions, half-inch wide and an inch ot two long, scattered randomly over the surface.  Also may cystal inclusions that glistened at different angles.  Looking at the edge of the slab, the inclusions were not deep, but almost like pieces of mica.  Are these types of "granite", as called by the dealer, reliable cadidates for a kitchen countertop?  Thanks.  TPP