Material properties of diamond to a very large kinetic energy barrier, diamonds are metastable; they will not decay into graphite under normal conditions. Material properties of diamond Diamond is the allotrope of carbon in which the carbon atoms are arranged in the specific type of cubic lattice called diamond cubic. Diamond is an optically isotropic crystal that is transparent to opaque. Diamond is the hardest naturally occurring material known. Yet, due to important structural weaknesses, diamond's toughness is only fair to good. The precise tensile strength of diamond is unknown, however strength up to 60 GPa has been observed, and it could be as
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,