There is also a stone known as “leucochrysos,”3182 with a white vein running across it. To this class, too, belongs capnias;3183 a stone also which resembles glass in appearance; and another which reflects a tint like that of saffron. These stones are imitated in glass, to such a degree of perfection, that it is impossible to distinguish them by the eye. The touch, however, detects the difference, the imitation being not so cold as the real stone.