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
Gemstone (database) of VMware, announced it had entered into a definitive agreement to acquire GemStone. On May 2, 2013, GemTalk Systems acquired the GemStone/S platform from Pivotal Software (the EMC and VMware spin-off).. Gemfire remained with Pivotal's Big Data division. The product is available standalone but is also integrated into its Cloud Foundry PaaS as "Pivotal Cloud Cache". GemStone builds on the programming language Smalltalk. GemStone systems serve as mission-critical applications. GemStone frameworks still see some interest for web services and service-oriented architectures. A recent revival of interest in Smalltalk has occurred as a result of its use to generate JavaScript for