Topazolite is the yellow variety and is also occassionally cut as a gem. Color is typically greenish gray to green but also black, yellow and rarely colorless. Luster is vitreous. Transparency crystals are transparent to translucent. Combinations of these forms are common and sometimes the rare faces of the hexoctahedron, a 48 sided crystal habit that rarely is seen by itself, can also combine with these other forms making very attractive, complex and multifaceted crystals.
Massive occurrences are also common.
Commonly forms crust that shows many rhombic faces Cleavage is absent. Fracture is conchoidal. Streak is white. Associated Minerals are micas , chlorite , diopside and serpentine . Best Field Indicators are crystal habit, color, index of refraction and hardness.