δρακοντίτης
From LSJ
ὅσῳ διαφέρει σῦκα καρδάμων → as different as chalk from cheese, different as chalk from cheese, apples and oranges, like apples and oranges, by as much as cardamom is different from figs
English (LSJ)
[ῑ] (sc. λίθος), ου, ὁ, A dragon-stone, conferring sharp vision, Ptol.Chenn.p.192 W.
Spanish (DGE)
-ου, ὁ mineral. dragontites piedra preciosa que según los antiguos se encuentra en la cabeza de las serpientes, Solin.30.16, Isid.Etym.16.14.7 (llamada tb. por Plinio draconitis siue dracontias Plin.HN 37.158), confiere una capacidad de visión extraordinaria ἣν καὶ δίκορον ... γενέσθαι, τὸν δρακοντίτην κτησαμένην ref. la esposa de Giges, Abas 2.