This garnet was discovered in the 1960s in the Tsavo area of Kenya, from which the gem takes its name.
Andradit tako kot drugi granati kristalizira v kubičnem kristalnem sistemu, prostorska skupina Iad z mrežnim parametrom a = 12,051 Å pri 100 K.Spinska struktura andradita ima pod Néelovo temperaturo (TN=11 K)dve ekvivalentni antiferomagnetni podmreži.