The sprays are unique and unlike other minerals that form acicular crystals. Although quite hard to describe, the clusters simply must be seen in order to appreciate their unusual character.
Color is white, colorless or gray.
Luster is silky to vitreous. Specimens are translucent. Crystal System is monoclinic. Crystal Habits include sprays of fine acicular or hair-like clusters also as fibrous crusts and rosettes. Cleavage is perfect but usually not discernible.