La clase química de los haluros se caracteriza por el predominio de los iones halógenos electronegativos, Cl-, Br-, F-,y I-, que son grandes, tienen carga de sólo -1 y se polarizan fácilmente.Cuando se combinan con cationes relativamente grandes, de valencia baja, tanto los cationes como los aniones se comportan como cuerpos casi perfectamente esféricos. 
Halite, rock salt or common salt has a cubic habit, isometric, In Wieliczka, Poland, is a salt deposit that was exploited since the thirteenth century until recent times. The mine is spread over nine levels and has about 300km of galleries.
What really overwhelmed at this mine is the space inside stereotomic emerged. Created by subtraction of matter, salt, following laws, geometries, scales, ... tectonics. Single volumes have been created, the result of the conjunction of man and geology.
The historical conditions, socio-economic wealth have plastic made its high interest, being built by the Unesco World Heritage-catalog Site.
occasion of the EXPO 2005 in Aichi, Japan
On, Polish architects 
Ingarden and Ewy, projected a pavilion inspired crystallography halite and Chopen music. http://whc.unesco.org/es/list/32
http://www.ingarden-ewy.com/
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