Is it Polished limestone or Marble?

Is it Polished limestone or Marble? Images

Is it Polished limestone or Marble?

Is it Polished limestone or Marble? Description

We bought a "Caliza Capri Polished LimeStone (http://g603.net) " fireplace. The brochure showed an off white fireplace. The type of LimeStone (http://g603.net) is Caliza Capri, apparently a Spanish limeStone (http://g603.net) . We are no expert of Stone (http://g603.net) s but it looks more like a cream coloured Marble (http://www.lightemprador.com) : it is as shiny, isn't "off white", and (http://maplered.com)  it has veins in it. How do I find out if it is Marble (http://www.lightemprador.com) or polished limeStone (http://g603.net) ?
Thanks for helping us.
Nick

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