This little gem is Oscularia deltoides.
Oscularia, because the little tooth-like edges make each pair of leaves look like a little mouth or osculum (Latin) and deltoides or delta-shaped as each leaf is triangular. In its home in South Africa, this succulent is known as dassie (hyrax) vygie (small fig) or sandsteenvygie because it grows in the sandstone country. I guess the rock hyrax must either live in the same terrain or like munching on the plant.
It has been doing beautifully in our Adelaide garden, in pots in morning sun and all day exposure to whatever weather we are having as well as in the ground, like the one in the photograph. The startlingly pink flowers are said to be almond scented, but mine are too low near the ground for me to breathe the perfume.
A tough plant for the Mediterranean garden despite its spun sugar flowers and celadon green fleshy leaves.
Photo: my own