Type of agate ( mineral) of laminated appearance. The name has Greek origin as 959; 957; 965; 958; ( onyx "nail" ) .
It's the name of a semi-precious stone. It's also called Onyice. Onyx in Greek, means nail. It's a glassy-looking oxide. According to the International Mineralogical Association, it is considered not mineral but a variety of agate or clacedonia.
Onyx : In pathology, variety of hypopion .