The cost of processing dense stones that are quarried underground is typically higher, making them more expensive. Conversely, stones that are quarried above ground are generally easier and less expensive to process. Additionally, factors such as the rarity of certain types of stone and the cost of long-distance shipping can also contribute to variations in pricing.

The qualities and characteristics of stone vary based on geological formations rather than geographical boundaries. For instance, stones quarried in one area may contain a higher amount of the mineral mica, resulting in a more brilliant shine of crystals.

To keep your stone in top condition, use warm water and mild soap for cleaning. Avoid acidic or abrasive cleaners, as they can damage the surface. After installation, seal the stone and reapply the sealant every 1 to 2 years to protect against stains and spills. Some sealers only require a single application every 12-15 years. Stone impregnator sealers work by bonding microscopic balls of silicone to the crevices inside the stone, creating a waterproof barrier. 

There is no emission of harmful radiation from granite. For detailed information, please visit the website of the Granite for Marble Institute of America.