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The most widespread classification system for pebble shapes in geology is the Zingg system which relies on several length measurements. Here we propose a completely different classification system which involves counting static equilibria. We show that our system is practically applicable: simple hand experiments are suitable and easy to use to determine equilibrium classes. We also propose a simplified classification scheme called E-classification which is considerably faster in practice thandoi:10.1556/ceugeol.53.2010.1.1 fatcat:bzcbfxd6qzel5cpldyuphbqyfm