Show agate and onyx the between agate and onyx la Is not apparent to everyone aa as ie lit indicated by tho the samples of the two mineral minerals received by the united states geological survey aith un requests for information onyx marble or mexican onyx la Is composed of calcium carbonate or banded limestone true agate Is 1 a variety ot of silica onyx marble la Is much otter softer than agate and la Is rarely tied ti ed for gema gems but when onyx Is a obtained in piece pieces of sufficient eizo size it Is in ut end prid polished for hinau ortin ornamental mental objects like and paper wei weights ghis le ae an well aa as for table topa tops and ad noda ater fountaine fountains |