This means they have:

* Six sides: forming a prism-like shape

* Two ends: capped with a pyramid-like structure

This is the most common shape for beryl, although there are variations depending on the specific type of beryl and its growth conditions. Some beryl crystals may also be found as:

* Short prisms: where the prism length is much shorter than the width.

* Irregular shapes: due to growth interruptions or imperfections.

Remember, these are just the basic forms. Beryl crystals can exhibit a variety of beautiful and complex shapes due to different growth patterns.