Granites are undoubtedly the most popular stone type used in countertop applications today. This group of stones includes many stone materials that are not true granites by geological definition. These stones are known geologically as gabbro, anorthosite, gneiss, diabase, and diorite, to name a few. These stones are some of the hardest of the countertop stones, offering high levels of resistance to abrasion and scratching. The primary minerals in granite are resistant to almost all chemicals commonly found in a home.