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Wednesday's Ask the Experts: Granite vs. marble

October 20, 2010
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Wednesday''s Ask the Experts question from a cleaning professional on the International Custodial Advisors Network (ICAN) "Ask the Experts" page: What is the difference between marble and granite and what was the technique to identify them?
The answer:
Marble is a metamorphic rock based on limestone while granite is volcanic in origin. Granite is much harder than marble, but both can be polished to a high gloss.
The simplest test I can think of consists of putting a few drops of ... — Lynn E. Krafft, ICAN/ATEX Editor
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