Marble vs Granite vs Quartzite — What's Actually the Difference?

The Confusion Is Real — and Costly

At stone yards worldwide, the terms "marble," "granite," and "quartzite" are sometimes used loosely or even interchangeably by salespeople. This causes expensive mistakes.

Marble: Metamorphic Limestone

Marble forms when limestone is subjected to intense heat and pressure deep underground. Key characteristics: Porous, acid-sensitive, etches from citrus/wine/vinegar, develops patina over time, requires annual sealing.

Granite: Igneous Rock

Granite crystallises from slowly cooling magma. Key characteristics: Very hard (Mohs 6–7), low porosity, chemically resistant, UV-stable for exterior applications.

Quartzite: Metamorphic Sandstone

Quartzite is formed when sandstone is metamorphosed under heat and pressure. It's the hardest of the three at Mohs 7. Many slabs sold as "White Marble" are actually quartzite — significantly harder and less porous.