Abstract
A definition of fundamental living units is given according to which they are constituted by the material support of some ‘memory’ the latter is required - to be stable, - to contain rich information, - to diffuse it into the surrounding medium. - to be stable, - to contain rich information, - to diffuse it into the surrounding medium. It is then shown that the complex dislocation networks encountered in crystals can in some cases follow these criteria and lead to a crystalline physiology. The places of possible occurrence in nature of this kind of physiology, terrestrial and extraterrestrial rocks, interplanetary dust, white dwarfs and neutron stars are then discussed.

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