What is minerality? Some use the term to describe that chalky, flinty texture in wines grown on rocky, or fossil-rich soils. It may come up when talking about the salty, brininess that seems to season wines made from grapes grown seaside. But the term remains elusive. Its definition may be imprecise, but you know it when you taste it. Here is a selection of six whites whose mineral qualities speak louder than words, so if you’re looking for answers, let your palate do the talking.