A new heterophyllosilicate mineral schullerite was found in the Lohley basalt quarry in the Eifel volcanic region, Germany, as a member of the late mineral assemblage comprising nepheline, leucite, augite, phlogopite, magnetite, titanite, fresnoite, barytolamprophyllite, fluorapatite, perovskite, and pyrochlore. Flattened brown crystals of schullerite up to 0.5 x 1 x 2 mm in size and their aggregates occur in miarolic cavities of alkali basalt. The mineral is brittle, with a Mohs hardness 3-4 and perfect cleavage parallel to (001). D (calc) = 3.974 g/cm(3). Its IR spectrum is individual and does not contain bands of OH-, CO (3) (2-) or H2O. Schullerite is biaxial (-), alpha = 1.756(3), beta = 1.773(4), gamma = 1.780(4), 2V (meas) = 40(20)A degrees. Dispersion is weak, r <nu. Pleochroism is medium X > Y > Z, brown to dark brown. Chemical composition (electron microprobe, mean of five-point analyses, Fe2+/Fe3+ ratio determined by the X-ray emission spectroscopic data, wt %): 3.55 Na2O, 0.55 K2O, 3.89 MgO, 2.62