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Wiktionary

zirconolite

n. (context mineralogy English) The mineral calcium zirconium titanate.

Wikipedia

Zirconolite

Zirconolite is a mineral, calcium zirconium titanate; formula CaZrTiO. Some examples of the mineral may also contain thorium, uranium, cerium, niobium and iron; the presence of thorium or uranium would make the mineral radioactive. It is black or brown in color.