The genus name Haworthia honors the British botanist Adrian Hardy Haworth (1767–1833), while the species epitheton mirabilis derives from Latin and means "wonderful".

Haworthia mirabilias is a succulent evergreen slow-growing species reaching a size of 4 to 45 centimetres (1.6 to 17.7 in) in height.

The leaves form a rosette and the flowers are white and small, in an inflorescence.

Its rosette of succulent leaves are turned back ("retuse") so as to provide a flat and level face on the surface of the ground.

It grows in rocky areas, especially slopes or ridges, at an altitude of about 500 meters.