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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. 

Yes, Corian® and other solid surface materials can be cut with standard woodworking tools, such as a circular saw or a jigsaw. However, it is crucial to use the correct type of blade to avoid damaging the material.

For a circular saw, a tungsten carbide-tipped blade is required; a triple chip grind blade is highly recommended. For a jigsaw, you should use a fine-tooth down-cutting blade. Do not use blades designed for cutting wood, as they can cause microfractures that weaken the edges of the countertop. A diamond blade is also unnecessary, as those are designed for harder materials like natural stone, which Corian is not.

After cutting, the edge will be rough. It is essential to sand and smooth the cut edge to prevent microfractures, which can eventually compromise the integrity of the countertop.

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.

The frequency for sealing granite countertops depends on several factors, including the type of sealant used, the color of the granite, and how heavily the countertops are used. As a general guideline, resealing is often recommended every 12 to 18 months, but some sources suggest it could be as often as every few months or at least once a year.

The type of sealant is a major factor: water-based sealants may need reapplication every six months to a year, while more durable solvent-based sealants can last for five to 10 years. Additionally, factors like heavy kitchen traffic, frequent use of acidic cleaners, and lighter granite colors may require more frequent sealing to prevent staining.

To determine if your countertops need resealing, you can perform a simple water test. Place a few drops of water or a wet paper towel on an inconspicuous area of the granite. After 10 to 15 minutes, check the spot. If the water has beaded up, the seal is still intact. If the water has been absorbed and darkened the stone, it's time to apply a new coat of sealant. You can choose to seal the granite yourself or hire a professional to ensure it's done correctly.