Mineral site, and from there further subdivided by the chemistry of the W site. The Y and Z sites can accommodate a variety of cations, especially various transition metals; this variability in structural transition metal content gives the tourmaline group greater variability in colour. Other cyclosilicates include beryl, AlBeSiO, whose varieties include the gemstones emerald (green) and aquamarine (bluish). Cordierite is structurally similar to beryl, and is a common metamorphic mineral. Sorosilicates, also termed disilicates, have tetrahedron-tetrahedron bonding at one oxygen, which results in a 2:7 ratio of silicon to oxygen. The resultant common structural element is the [SiO] group. The
Aquamarine (novel) to Florida, the girls are dismayed. They spend hours trying to make their last days together as long as possible, both frightened by the future. When a violent thunderstorm occurs, a large quantity of trash is deposited in the Capri Beach Club. In the swimming pool, Hailey and Claire discover the spoiled yet beautiful creature that will change their lives: a mermaid named Aquamarine. The next morning, Aquamarine surfaces after some hesitation, being stimulated to do so by the presence of the handsome Raymond. During the night, Aquamarine has undergone mild hardships; she has eaten very little, has been separated