1) Mineral 
Baddeleyite is a rare zirconium oxide mineral (ZrO2 or zirconia), occurring in a variety of monoclinic prismatic crystal forms. It is transparent to translucent, has high indices of refraction, and ranges from colorless to yellow, green, and dark brown. See etymology below. Baddeleyite is a refractory mineral, with a melting point of 2700 °C. Haf...
(from the article `dating`) ...intercalibration. In some cases the discovery of a rare trace mineral results in a major breakthrough as it allows precise ages to be determined ... ...it was once true that only certain felsic igneous rocks (those consisting largely of the light-coloured, silicon and aluminum-rich minerals ... [2 relat...
Zirconium oxide, di-
[n] - a mineral consisting of zirconium oxide
Zr)2 A zircon material. A by-product of working certain carbonatites.
noun a mineral consisting of zirconium oxide