09163 - Top Beautiful 10.31 Inch Purple Natural Amethyst Geode Minas Gerais District - Brazil Elosuchus Erythrite and annabergite (Ni3(AsO4)2·8H2O) (nickel

Erythrite and annabergite (Ni3(AsO4)2·8H2O) (nickel arsenate) form a complete series with the general formula (Co

graphite daubreelite

Age range: 402

917’N Longitude: 7°36

Stenopareia

09163 - Top Beautiful 10.31 Inch Purple Natural Amethyst Geode Minas Gerais District - Brazil Elosuchus Erythrite and annabergite (Ni3(AsO4)2·8H2O) (nickelAmethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiation, impurities of iron and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. The hardness of the mineral is the same as quartz, thus making it suitable for use in jewelry.