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Geological----As we all know (Bonz et al, 1999; Uri et al., 1999) veins are caused by infilling of mud cracks in shallow lakes with snail shells and snake bones, which recrystallize to form thin calcite-rich tabular bodies.A relatively thin, normally tabular, rock mass of distinctive lithologic character, cross-cutting the structure of the host rock. (AAPG International Tectonic Dictionary 1967)