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Quartzite is more expensive than granite, largely because of its rarity. Granite is naturally more common. A granite slab generally costs $40 to $60 per square foot (excluding super-rare types), while quartzite slabs cost anywhere from $50 to $150 per square foot. 

With both materials, it’s usually more affordable to purchase stones that are readily available in your location. You may need to import other stones, which come at a higher cost.

Overall, granite tends to cost more than marble. Prices for each material will fluctuate depending on the source of the stone, your location, shipping costs, and the thickness of the material. Labor to install marble or granite countertops typically ranges from $35 to $45 per hour. Granite and marble tile and slab costs compare as follows:

• Marble tile: $7–$10

• Granite tile: $5–$15

• Marble slab: $25–$60

• Granite slab: $50–$100

Marble is a porous natural stone that needs sealant to minimize staining. Leaving this type of countertop material sealant-free means any liquids left on the surface will quickly absorb into the stone, discoloring it and dulling the sheen. Dark or acidic liquids, like red wine, coffee, and lemon, are the worst culprits. 

The cost to install a kitchen island ranges from $900 to $6,500, with an average price of around $4,800. The final cost depends on whether you buy a prefabricated unit or have one custom-built. Prefabricated kitchen islands are generally cheaper. A simple prefabricated cart can cost between $150 and $900, while a permanent, stationary prefabricated island costs from $900 to $5,000. A custom-built kitchen island averages around $4,800 but can cost $10,000 or more depending on factors like materials, size, design complexity, and accessibility.