Friday''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?
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 ... — Lynn E. Krafft, ICAN/ATEX editor
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