Zirconium hydride an ore, usually a zirconium silicate, such as zircon. Zirconium is extracted from zirconium ore by removing the oxygen and silica. This process, known as the Kroll process, was first applied to titanium. The Kroll process results in an alloy containing hafnium. The hafnium and other impurities are removed in a subsequent step. Zirconium hydride is created by combining refined zirconium with hydrogen. Like titanium, solid zirconium dissolves hydrogen quite readily. The density of zirconium hydride varies based the hydrogen and ranges between 5.56 and 6.52 g cm. Even in the narrow range of concentrations which make up zirconium hydride,
Cubic zirconia technique first applied to quartz and topaz has also been adapted to cubic zirconia: vacuum-sputtering an extremely thin layer of a precious metal (typically gold) or even certain metal oxides or nitrides amongst other coatings onto the finished stones creates an iridescent effect. This material is marketed as "mystic" by many dealers. Unlike diamond-like carbon and other hard synthetic ceramic coatings, the effect is not durable with decorative precious metal coatings due to their extremely low hardness compared to the substrate along with poor abrasion wear properties. There are a few key features of cubic zirconia which distinguish it from