Gabbro | A soil type described by Tom Stevenson (2011) as ‘a dark, coarse-grained igneous rock found in Muscadet.’ Also described as dark brown, a basic type parent rock giving clayey soils.

Bibliography

Tom Stevenson (2011) The Sotheby’s Wine Encyclopedia 5th Edition by Tom Stevenson (Dorling Kindersley, 2011), p.17-19.