Zirconium dioxide jewellery. Like diamond, cubic zirconia has a cubic crystal structure and a high index of refraction. Visually discerning a good quality cubic zirconia gem from a diamond is difficult, and most jewellers will have a thermal conductivity tester to identify cubic zirconia by its low thermal conductivity (diamond is a very good thermal conductor). This state of zirconia is commonly called "cubic zirconia", "CZ", or "zircon" by jewellers, but the last name is not chemically accurate. Zircon is actually the mineral name for naturally occurring zirconium silicate (ZrSiO). Zirconium dioxide Zirconium dioxide (), sometimes known as zirconia (not to be
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