The nuclear magnetic resonance (NMR) technique is used in geophysics mainly for well logging and laboratory applications. Consequently, the available investigations focus on the NMR properties of solid rocks, because of their significance as hydrocarbon reservoir rocks (Kenyon, 1992). In recent years Surface NMR (SNMR) has become available for hydrogeological applications (e.g. Shirov et al., 1991, Yaramanci et al., 1999). The need for well founded interpretation of SNMR field data has steeply increased the interest in NMR properties of unconsolidated rocks. In our work we therefore analyzed the NMR properties of synthetic and natural unconsolidated samples to enable an enhanced understanding and interpretation of SNMR data.