Busch's 2018 Riesling Vom Grauen Schiefer is the purest and most stony-flavored of the trio wines from red-blue-gray slate soils. The Riesling from gray slate is almost unwelcoming in its ascetic, stony, crunchy, lemony and yeasty purity, which might be challenging for beginners looking for fruit but is surely exciting for true Riesling freaks. The nose is definitely complex and develops with air, becoming finer and slightly more fruity. It's definitely a wine for nerds, though. The palate is very elegant and refined, revealing a full-bodied palate with rich, intense and concentrated yet also juicy fruit and remarkable complexity on the sustainable and mineral finish. 12.5% alcohol. Tasted from AP 3019 in July 2020.