Cristais de quartzo - Quartz

Posted by Arco-Íris (Leiria, Portugal) on 30 May 2009 in Miscellaneous and Portfolio.

A minha viagem pelo Parque Nacional Peneda-Gerês. - Fim da 1ª. Parte
Quartz is the most abundant mineral in the Earth's continental crust. It is made up of a lattice of silica (SiO2) tetrahedra. Quartz has a hardness of 7 on the Mohs scale and a density of 2.65 g/cm³.

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