Luis Seabra, Douro Xisto Ilimitado Branco

This is a beautifully deep and round white, with intense mineral notes and great freshness.  From the importer:

A wine that offers an introduction to the dominant soil type in the Douro valley. Minimal interventionist wine-making. Fresh, mineral driven white that showcases the beautiful schist soil of the Douro.
60% Rabigato, 15% Gouveio, 15% Códega, 10% Viosinho. 30-45 year old vines, planted to mica schist at 500-600 m (1,640 -1,968 ft) elevation.