Color is yellow, orange, pink, white or blue. Luster is vitreous or pearly. Crystals are translucent to more rarely transparent. Some prismatic to columnar crystals are found. Cleavage is perfect, in three directions, prismatic, but rarely seen in massive specimens.
Fracture is conchoidal to uneven.
Streak is white. Will effervescence in warm hydrochloric acid. Associated Minerals include feldspars such as albite , biotite , hornblende , nepheline , sodalite and other feldspathoids . Best Field Indicators reaction to acids, associations, locality and hardness.