When it comes to using natural stone for decoration, granite and marble are the most popular choices. To ensure you make the right decision, there are several key factors to consider when selecting your stone.
1. Examine the Appearance
First, inspect the stone for any visible imperfections such as cracks, chipped edges, color lines, pits, bubbles, warping, or stains. These can affect the overall aesthetic and durability of the material. A good way to check the visual quality is to place the stone in a well-lit area and view it from about 1.5 meters away. This helps you see if the color and pattern remain consistent and appealing.
2. Check the Surface
The surface texture is another important aspect. High-quality granite typically has a uniform grain structure with a fine, even appearance. Poor quality granite may have uneven grains or a rough texture. For marble, look for a smooth, glossy finish with consistent color and no signs of repair work. Lower quality marble might show scratches, dullness, or irregular patterns.
For specific applications, the type of granite matters. Polished granite is ideal for countertops and interior flooring due to its high gloss, density, and resistance to stains. However, if you're looking for materials suitable for stairs or outdoor areas, opt for textured options like lychee or fired granite, which offer better slip resistance and maintain their natural beauty over time.
Marble, on the other hand, is best suited for indoor use. It's commonly used for walls, floors, window sills, and TV cabinets, but should not be used outdoors due to its sensitivity to weather and moisture.
3. Perform an Ink Test
A simple yet effective test involves placing a drop of ink on the back of the stone. If the ink spreads quickly and soaks into the stone, it indicates a porous and weak material. On the other hand, if the ink remains concentrated and doesn’t penetrate, the stone is dense, compact, and more durable.
4. Review the Test Report
It's crucial to check the radionuclide levels of the stone, especially if it's intended for use in homes. Some stones naturally contain higher levels of radiation, making them unsuitable for indoor spaces. Always request a radionuclide test report from the seller, and pay attention to the origin of the stone, the type of radionuclide present, and the recommended usage area.
5. Consider the Color
When choosing granite for your home, be mindful of the color. Stones with red, brown, green, or red spots may have higher radionuclide levels compared to other colors. While these types of granite aren't ideal for indoor use, you can still use them if you verify the radionuclide levels through a certified test report. In doubt, it’s always wise to send a sample to an independent testing facility for confirmation.
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