It is found as needle-like or prismatic crystals in pegmatite.

It is typically massive in form, but does at times develop thin tabular to prismatic crystals.

It crystallizes in the monoclinic system and forms prismatic crystals.

At normal conditions, it forms red prismatic crystals.

The mineral forms prismatic needle-like crystals, but is more typically massive.

It forms prismatic crystals which often form radiating or spherical clusters.

It crystallizes in the hexagonal crystal system and forms small prismatic brown crystals.

The prismatic crystals are typically colorless, turning white on partial dehydration.

It forms as rough, prismatic crystals, typically in dense aggregates.

Not only is it abundant in prismatic crystals, but it's rich in iron, too.