Baddeleyite is a rare zirconium oxide mineral occurring in a variety of monoclinic prismatic crystal forms. It is transparent to translucent, has high indices of refraction (na=2.130, nß=2.190, and n?=2.200), and ranges from colorless to yellow, green, and dark brown. The baddeleyite mineral has a specific gravity of 5.5 to 6 and a Mohs hardness of 6.5. it is a refractory mineral, with a melting point of 2700 °C. Baddeleyite was first occurred in 1892 from Sri Lanka, and Minas Gerais and Jacupiranga, São Paulo, Brazil. It was named after Joseph Baddeley, who described the occurrences in Sri Lanka.

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