Single crystal
Viewing under a petrographic microscope, the crystals contains a scattering of minute bubble-like inclusions. Paulingite is mostly isotropic and in extreme cases that faint, isolated, fuzzy and weak birefringent twinning which is a determining factor for differentiating paulingite from analcite (). The refractive index at 230 in sodium vapor light by immersion method is 1.473. Single crystal diffraction study provides information that paulingite is cubic and the cubic length of a0= 35.10 Å. It was determined from rotation photograph using copper Ka radiation, nickel filtered, with the film in self-calibrating arrangement. The reflections were indexed with the help of a zero-layer Weissenberg photograph. Reflections of the type hkl for l=0 to l=12 have been examined with equi-inclination weissenberg photographs, and only reflections having h+k+l even are observed, indicating a body-centered lattice. The crystal system is isometric. The space group of the paulingite is Im3m and the point group is 4/m3 2/m (Kamb and Oke 1960).