Greenish blue beryl is a very rare variety of beryl from Madagascar.
Usualy, a greenish blue or bluish green beryl is clasified as aquamarine. But this “neon intense greenish blue” color is very rare. It is comparable with the color of Paraiba tourmaline.
The chemical composition of greenish blue beryl is beryllium aluminium cyclosilicate with the chemical formula Be3Al2(SiO3)6. Well-known varieties of beryl include emerald, also aquamarine, heliodor, goshenite and morganite. Naturally occurring, hexagonal crystals of beryl can be up to several meters in size. Terminated crystals are relatively rare. Pure stone is colorless, the color is due to inclusions. Possible colors are green, blue, yellow, red (the rarest), and white. It is also an ore source of beryllium.
Beryl belongs to the hexagonal crystal system. Normally it forms hexagonal columns but can also occur in massive habits. As a cyclosilicate it incorporates rings of silicate tetrahedra that are arranged in columns along the C axis and as parallel layers perpendicular to the C axis, forming channels along the C axis. These channels incorporate a variety of ions, neutral atoms, and molecules into the crystal. Thus disrupting the overall charge of the crystal permitting further substitutions in Aluminium, Silicon, and Beryllium sites in the crystal structure. The variety of colors comes from impurities. Increasing alkali content within the silicate ring channels causes increases to the refractive indices and birefringence.
Greenish blue beryl from Madagascar
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