The term torch refers to crystals that taper to a smaller base. The term cathedral in this sense means that a central large crystal is surrounded by smaller, parallel crystals that are tightly attached to the central one. The silhouette may look like the tower of a cathedral. Light reflections appear almost simultaneously on faces of the same type.
Amethyst is the purple variety of quartz crystal composed of silicon dioxide with traces of iron.
As a healing stone it is said to be helpful in ridding nightmares. Also helpful to calm an overworked and over stressed mind. It is thought to dispel negativity and create a peaceful environment.