Structural symmetry of an emerald, illustration C039/4528

Structural symmetry of an emerald, illustration

Código da imagem : C039/4528
Dimensões : 4.800 X 5.700 pixels
Orientação : horizontal

Data do upload no fornecedor : 18/07/2018
Tamanho máximo não comprimido : 78,3MB

Pauta:	Structural symmetry of an emerald, illustration
Título:	Structural symmetry of an emerald, illustration
Descrição:	Structural symmetry of an emerald, illustration. Emerald is a variety of beryl, a mineral built around 12-membered crown-shaped rings of six tetrahedral silicon atoms (blue) alternating with six bridging oxygen atoms (violet). Each silicon atom is also bonded to two other oxygen atoms that are shared with beryllium(2+) and aluminium(3+) cations. These metal ions form a second ring that encloses the first. The outer ring has six aluminium oxide (AlO6) octahedra (light green) alternating with six tetrahedral beryllium oxide (BeO4) groups (darker green). The rings create channels that contain caesium(+) (yellow-green) and sodium(+) (lavender) ions. Pure beryl is colourless, but trace amounts of impurities give coloured gemstones. Emerald is a green form of beryl contaminated with chromium(3+) in some of the aluminium(3+) sites. The pale blue aquamarine has iron(2+) impurities; iron(3+) impurities give golden heliodor, and morganite is pink due to manganese(2+).
Coleção:	Science Photo Library
Crédito:	GREG WILLIAMS/SCIENCE PHOTO LIBRARY/ Fotoarena
Disponibilidade:	imediata
Direito de uso:	Direito controlado
Autorização do(a) modelo:	não
Autorização da propriedade:	não

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