One of the most striking occurrences is made up of very thin anatase plates impaled on fine aegirine needles. Color is predominantly black, less commonly brown and rarely dark blue. Luster is adamantine to metallic. The black crystals are opaque while the brown and the blue are translucent. Crystal Habits include the tetragonal dipyramid, equant and the tabular habit with dominant pinacoid.
Fracture is subconchoidal.
Streak is white. Distinguishing Features the combination of crystal habit, color and luster is distinctive.