An early Christian tradition deriving from Papias of Hierapolis (c.60–c.130 AD) attributes authorship of the gospel to Mark, a companion and interpreter of Peter, but most scholars believe that it was written anonymously, and that the name of Mark was attached later to link it to an authoritative figure.

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Onyx (Wikipedia) Onyx is the parallel-banded variety of chalcedony, a silicate mineral. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands. Onyx has parallel bands, while agate has curved bands. The colors of its bands range from black to almost every color. Specimens of onyx commonly contain bands of black or white or both. Onyx, as a descriptive term, has also been applied to parallel-banded varieties of alabaster, marble, calcite, obsidian, and opal, and misleadingly to materials with contorted banding, such as “cave onyx” and “Mexican onyx”.

Gospel of Mark (Wikipedia) The Gospel of Mark is the second of the four canonical Gospels and one of the three synoptic Gospels. It narrates the ministry of Jesus from his baptism by John the Baptist to his death, the burial of his body, and the discovery of his empty tomb. It portrays Jesus as a teacher, an exorcist, a healer, and a miracle worker. Jesus refers to himself as the Son of Man and is called the Son of God, though he keeps his messianic nature secret; even his disciples fail to understand him. This is in keeping with the Christian interpretation of prophecy, which is believed to foretell the fate of the messiah as a suffering servant.