It was of three colors--light blue, dark blue, and purple.
The golden specks, however, with which it was sprinkled--really spots of yellow pyrites--rendered it useless to the gem-engravers of Pliny's time.

The zathene, the gassinades, and the narcissitis were gems of inferior value.

As they have not yet been identified with any known species, it will be unnecessary to prolong the present chapter by a consideration of them..