Basically it's the same chemical substance (SiO2), the difference is mainly in inclusions which lead to different look. Onyx is black in general and agate is lighter, more brownish.
This is from my online dictionary: a semiprecious variety of agate with different colors in layers.
an ornamental stone consisting of a hard variety of chalcedony, typically banded in appearance.
• a colored toy marble resembling a banded gemstone.
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