Onyx primarily refers to the parallel banded variety of the silicate mineral chalcedony. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands: agate has curved bands and onyx has parallel bands. The colors of its bands range from black to almost every color

Riverstone is a sedimentary rock, a form of limestone. It is not to be confused with the red and yellow Patuxent River Stone, an agate and cryptocrystalline form of quartz. Riverstone, or river stone, is also a used as a generic term for an undifferentiated mix of rocks found in a river bed.

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Granite Bathtub