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) now grown very fond of Aquamarine, and she of them. Hailey and Claire arrive to take Aquamarine back to the ocean. They meet Raymond, who regrets that he cannot bid Aquamarine farewell before he leaves for Florida. Just then, a boy named Arthur falls into the swimming pool. Aquamarine rescues him, with the help of Raymond. Raymond, seeing her tail and thus realizing she is a mermaid, is utterly shocked, however, this discovery does nothing to impair his adoration of her. Hailey and Claire carry Aquamarine to the ocean and cast her into the water, where she is restored to