The typical termination appears to be two faces of a slightly slanted dome but is actually two of the four faces of a prism. The termination faces are not only slanted toward each other but the two faces are slanted with respect to the long axis of the crystal as well. Some terminations are rather complex and can make the crystal appear pseudo-orthorhombic. Due to dissolution reactions after initial crystallization, the crystal faces can appear pitted and the terminations can be rounded. Cleavage is imperfect in two directions at nearly 60 and 120 degrees.
Fracture is uneven.
Hardness is 6. Streak is white. Crystals can have a iridescent shimer and associated minerals can be seen intergrown in some of the crystals filling pits and voids on their surface. Associated Minerals are biotite , molybdenite , cancrinite and calcite Notable Occurrence is several sites near Wilberforce, Ontario, Canada.