"Tungsten" was the old Swedish name for the mineral scheelite. The ore minerals of tungsten include wolframite, scheelite, and ferberite. The road is also known as Nevada Scheelite Mine Road. Its associated minerals include pyrite, chalcopyrite, quartz, anhydrite, fluorite, and scheelite. It forms a solid solution series with scheelite (calcium tungstate, CaWO). Similar materials are calcium tungstate (scheelite) and zinc tungstate. Scheelite streaks white and is brittle. Its important ores include wolframite and scheelite. KIO forms tetragonal crystals of the Scheelite type (space group "I"4/). Much less common than colorless zircon is colorless scheelite. Conversely, synthetic scheelite is often without such a spectrum. Along with scheelite, the wolframite series are the most important tungsten ore minerals. Scheelite, the mineral calcium tungstate, often contains a small amount of molybdate. Aside from pseudo-octahedra, scheelite may be columnar, granular, tabular or massive in habit. Scheelite fluoresces under shortwave ultraviolet light, the mineral glows a bright sky-blue.