Why Marble and Granite Need Different Care
Marble and granite share the 'natural stone' label but differ fundamentally in mineralogy. Marble is calcite-based, moderately porous and acid-sensitive. Granite is silicate-based, very low porosity and chemically robust.
The critical rule for marble: avoid all acid-containing products. Vinegar, lemon juice, orange-based cleaners and carbonated drinks can cause immediate dull spots (chemical etching) on a polished marble surface. Granite is far more tolerant — though even granite countertops benefit from prompt removal of acidic cooking residue.