Here's why:
* Granite is an igneous rock, meaning it's formed from cooled magma. It's typically very hard and resistant to scratching, thanks to its quartz and feldspar composition.
* Marble is a metamorphic rock, formed from limestone. It's softer than granite and more susceptible to scratching and etching.
Instead of saying one is "harder," it's more accurate to consider their specific properties:
* Hardness: Granite is generally harder than marble. It ranks higher on the Mohs Hardness Scale.
* Durability: While granite is generally more durable, marble can be polished to a very high shine and is often used for sculptures and decorative purposes.
To truly compare hardness, you'd need to consider:
* The specific type of granite and marble: There are many variations in both types of rock, each with different mineral compositions and properties.
* The method of testing hardness: Different tests measure hardness differently.
Ultimately, both granite and marble have their own strengths and weaknesses depending on the application.
