A new classification system for pebble and crystal shapes based on static equilibrium points

Tímea Szabó, Gábor Domokos
2010 Central European Geology  
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 than
more » ... r in practice than the classical Zingg method. Based on statistical results of 1000 pebbles from several different geologic locations we show that E-classes are closely related to the geometric shape of pebbles. We compared E-classes to the Zingg classes, and we found that all the information contained in Zingg classification can be extracted from equilibrium classification. However, the new method is more sophisticated: it may help to identify shape attributes not discovered so far and it is able to store information on special geometries, e.g. on crystal shapes. A new classification system for pebble and crystal shapes based on static equilibrium points 5
doi:10.1556/ceugeol.53.2010.1.1 fatcat:bzcbfxd6qzel5cpldyuphbqyfm