A single large crystal (4.75 cm tall = 1.87 in.) of schorl is shown in the following image. The overall shape of the crystal is triangular and has striations on all of its sides. The provenance of this crystal is unknown.
This image is a closeup showing a divergent fibrous aggregate of acicular (needle-like) tourmaline crystals, which are concentrated in the upper half of the image. The tourmaline in the lower half of the image is blocky. The entire field of view is about 1 cm in height.
The image below shows a small of piece of a tourmaline-bearing granite (5.5 cm width) from a pegmatite at the Stewart Mine near Pala, San Diego County, Southern California. These crystals of schorl are somewhat massive (structureless).