Period 2 element a supplement for the prevention and treatment of osteoporosis and arthritis. Carbon is the chemical element with atomic number 6, occurring as C, C and C. At standard temperature and pressure, carbon is a solid, occurring in many different allotropes, the most common of which are graphite, diamond, the fullerenes and amorphous carbon. Graphite is a soft, hexagonal crystalline, opaque black semimetal with very good conductive and thermodynamically stable properties. Diamond however is a highly transparent colourless cubic crystal with poor conductive properties, is the hardest known naturally occurring mineral and has the highest refractive index of all gemstones. In
Arizona Mining and Mineral Museum Parts of the collection were expected to be included in the planned centennial museum, which was to be called the Arizona Experience Museum. The mineral collection features displays of minerals from well-known Arizona mineral localities and specimens from Arizona copper mines, including a piece of native copper that is in its longest dimension. Displays on the lapidary arts feature faceted gemstones and cabochons made from Arizona minerals. Mineralogical principles are illustrated by displays on mineral crystal systems, crystal habits, fluorescent minerals, and causes of color. Unusual items in the mineral collection include a piece of the Meteor Crater meteorite, fulgurites,