This is a desert plant from Mexico. The botanical genus is Ariocarpus and it’s classified as one of the cactaceae (argh … those botanists/taxonomists…😉 ). anyway this succulent plant is as hard as rock and in its natural habitat it’s already happy with one annually flood rain. When it’s dry for a longer period it ‘draws’ itself more or less into the soil. Fairly rare plant; even specialised nurseries normally don’t have these in stock but some collectors do. The estimated age of this plant is around 30 years.