High Quality Content by WIKIPEDIA articles! 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 (n? = 2.130, n? = 2.190, and n? = 2.200), and ranges from colorless to yellow, green, and dark brown. The mineral has a specific gravity of 5.5 to 6 and a Mohs hardness of 6.5. Baddeleyite is a refractory mineral, with a melting point of 2 700 °C. Hafnium is a substituting impurity and may be present in quantities ranging from 0.1 to several percents. Baddeleyite was first described in 1892 from Sri Lanka, and Minas Gerais and Jacupiranga, Sao Paulo, Brazil. It was named after Joseph Baddeley, who described the occurrences in Sri Lanka.

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