Onyx

Dear Bianca:

Onyx-marble does not require anything different that any good-quality specialty products for marble and other natural stones. Of course, being as dense as it is it can't be sealed; but it still does need particular attention due to its high calcite/aragonite content.

By logging into the Helpful Hints section of our website at: http://www.marblecleaning.org/helpful-hints.htm , you will be able to get the short version of our maintenance guidelines at no charge. The full version of it – a 7-page document considered by many as an industry benchmark – is available in pay-per-download format in our Educational Literature section at: http://www.marblecleaning.org/literature.htm .  

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Thank you  

Ciao and good luck,

Mauri z io Bertoli