Ametista Geodes - Altura: 36 cm - Largura: 18 cm- 11.6 kg

Amethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiation, impurities of iron (Fe3+) and in some cases other transition metals, and the presence of other trace elements, which result in complex substitutions in the crystal lattice. The irradiation causes the iron Fe3+ ions that replace Si in the lattice to lose an electron and form a [FeO4]0 color center. Amethyst is a three-dimensional network of tetrahedra with the silicon atoms in the center and surrounded by four oxygen atoms located at the vertices of a tetrahedron. This structure is quite rigid and results in quartz's hardness and resistance to weathering. The mineral's hardness is the same as that of quartz, making it suitable for use in jewelry.

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Excluded are overseas territories.
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