Baddeleyite
![Crystal structure of baddeleyite[7]](/uploads/202412/22/BaddeleyiteStructure1837.png)
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.