Where the mistake occurs, a mirror plane is produced. If this occurs another time, forming three twins, that are joined in a circle, then a trilling is created. The symmetry of the crystal will appear hexagonal but is still orthorhombic. Witherite's twins are typically capped with a six sided pyramid and often are dipyramidal. Witherite is an interesting and valuable collection specimen that anyone, especially a collector of twinned minerals, would love to own.
Color is white, colorless, gray, brown, yellowish or greenish.
Luster is vitreous to dull. Transparency crystals are transparent to usually translucent. Often they are dipyramidal without any prism faces. The faces are usually striated perpendicularly. Also there are botryoidal, massive and fibrous forms.