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) Aquamarine (novel) Aquamarine is a novel by Alice Hoffman, published in April 2001. A film adaptation was released in 2006, although the plot of the film bears little resemblance to that of the book. The story is based upon two schoolgirls, Hailey and Claire, who have lived as neighbors and best friends for many years. Their favorite place for amusement has been the Capri Beach Club for as long as they can remember. However, the Capri Beach Club has become ruinous via neglect by its staff. When Claire's grandparents, with whom she lives, decide to leave the area and move