- Chalcedony (Wikipedia)
Chalcedony (/kælˈsɛdəni/ kal-SED-ə-nee, or /ˈkælsəˌdoʊni/ KAL-sə-doh-nee) is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic. Chalcedony’s standard chemical structure (based on the chemical structure of quartz) is SiO2 (silicon dioxide).
- Rob Reiner (Wikipedia)
Robert Reiner (born March 6, 1947) is an American actor and filmmaker. As an actor, Reiner first came to national prominence with the role of Mike “Meathead” Stivic on the CBS sitcom All in the Family (1971–1979), a performance that earned him two Primetime Emmy Awards.