Davanite, a new alkali titanosilicate recently described from Siberia, has been found associated with coexisting orthorhombic and rhombohedral Ca-Sr carbonates in the Smoky Butte lamproite. The new chemical composition and X-ray diffraction pattern agree closely with those of the type specimen. The presence of this late-crystallizing mineral is explained by the peculiar Ti-rich, K-rich peralkaline silica-saturated composition of the Montana lamproites.

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