jueves, 5 de marzo de 2009

Gif Letras, Numeros y Simbolos en Rombos

Zeolite: A class of silicates containing H=O in cavities within the crystal structure. Formed by alteration at low temperature and pressure of other silicates, often volcanic glass.


Zoned crystal: A single crystal of one mineral that has a different chemical composition in its inner and outer parts. Formed from minerals belonging to a solid-solution series, and caused by the changing concentration of elements in a cooling magma that results from crystals settling out.


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