Hexagonal: Having six sides.

Tabular: Said of a feature having two dimensions that are much larger or longer than the third.

Pinacoid: A pinacoid is composed of only two parallel faces.

Multi-terminated: Multi-termination refers to a habit in which a columnar hexagonal crystal is terminated by multiple needle-like elements, which are often serrated. This is neither an <i>official</i> term, nor is the Vorobyevite Museum hung up on it, but you have to call it something.