Diamond cubic strong isotropic property. Namely, for any two vertices "x" and "y" of the crystal net, and for any ordering of the edges adjacent to "x" and any ordering of the edges adjacent to "y", there is a net-preserving congruence taking "x" to "y" and each "x"-edge to the similarly ordered "y"-edge. Another (hypothetical) crystal with this property is the Laves graph (also called the K crystal, (10,3)-a, or the diamond twin). The compressive strength and hardness of diamond and various other materials, such as boron nitride, is attributed to the diamond cubic structure. Similarly truss systems that follow the diamond
Mineral Historic District Mineral Historic District Mineral Historic District is a national historic district located at Mineral, Louisa County, Virginia. It encompasses 222 contributing buildings, 3 contributing sites, and 6 contributing structures in the town of Mineral. It includes a variety of residential, commercial, and institutional buildings built after the town was platted in 1890. Notable buildings include the Gibson House (1915), Turner House (c. 1915), Dr. H. J. Judd House (1906), Odd Fellows Hall (1894), former D.E. Bumpass Department Store, former Mineral Drug Store, Bank of Louisa (now Town Hall), C&O railroad depot (1880s), Mineral Crystal Ice Plant (c. 1925), Louisa County