This grower is fairly sure of this plant identification.
A dark green fairly slow growing succulent, H. limifolia is probably best planted in a shallow bowl/half pot as it produces many offsets (some of which find their way through the drainage holes) and will gradually colonise the space provided for it.
Haworthia genus. These are basal-rosettes. There are about 150 species. They are clump-forming perennial succulents with triangular to rounded green leaves which are marked with distinctive white spots. The flowers are produced in racemes of insignificant white or occasionally yellow 6-lobed flowers which appear in the summer. Roots tend to wither in winter or during long periods of drought. Frost tender, min. 5-I0C . Needs partial shade to stay green and grow quickly; if planted in full sun it turns red or orange and grows slowly. Requires very well drained soil. Keep dry in winter. Propagate by seed or division from spring to autumn.
Keep dry in winter.