The termination is typically capped by a dome forming a roof like top. Another dome can modify the termination producing a point at the juncture of the two domes. A basal pinacoid can flatten the prisms termination or truncate the top of the domes. The pinacoid, multiple domes and occassionally orthorhombic pyramid faces can produce a complex, multifaceted and well formed termination. Topaz can be granular and massive.
Cleavage is perfect in one direction, basal.
Fracture is conchoidal. Hardness is 8. Streak is white. Associated Minerals include quartz , tourmalines , micas , brookite , cassiterite and fluorite . Prism faces maybe striated lengthwise.