<Li> Schist - Laminated, crystalline rock based soil that retains heat well and is rich in magnesium and potassium but is poor in organic nutrients and nitrogens . </Li> <Li> Shale - Fine grain sedimentary based soil that can turn into slate when under pressure . The soil is moderately fertile and retains heat well . </Li> <Li> Siliceous soil - Soil composed of acid rock that are crystalline in nature . The soil has good heat retention but needs the added composition of silt, clay and other sedimentary soils to have any kind of water retention . The range of this soil can include organic materials like Kieselguhr and flint or inorganic materials like quartz . This soil type covers half of the wine regions of Bordeaux . </Li> <Li> Silt - Soil type consisting of fine grain deposits that offer good water retention but poor drainage . It is more fertile than sand . </Li>

What type of soil do wine grapes like