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Marble and onyx are both natural stones that are often used for decorative purposes, such as countertops, flooring, wall cladding, and sculptures. While they share some similarities, they are distinct in several key ways:

1. Composition:

• Marble: Marble is a metamorphic rock primarily composed of calcite or dolomite minerals. It forms when limestone undergoes intense heat and pressure, resulting in a crystalline structure. Marble can have a variety of colors and veining patterns depending on the mineral impurities present during its formation.
• Onyx: Onyx is a sedimentary rock composed of layered bands of minerals, primarily calcite or aragonite. It forms in caves as stalagmites and stalactites, resulting in a banded or layered appearance. Onyx is known for its translucency, allowing light to pass through, which gives it a unique visual appeal.

2. Color and Appearance:

• Marble: Marble comes in a wide range of colors, including white, gray, black, green, pink, and more. Its appearance is characterized by veining, streaks, and patterns created by mineral impurities.
• Onyx: Onyx is known for its striking appearance, featuring translucent bands of color. These bands can be various shades, including white, beige, brown, red, green, and black. The translucency of onyx allows it to be backlit for a dramatic effect.

3. Durability:

• Marble: Marble is relatively durable but is susceptible to scratching, staining, and etching from acidic substances. It's commonly used in areas with less wear and tear, such as bathrooms and decorative features.
• Onyx: Onyx is softer and less durable than marble. It is even more prone to scratching, etching, and staining due to its composition. As a result, it is often used in low-traffic areas and as a decorative accent rather than for high-use surfaces like kitchen countertops.

4. Use Cases:

• Marble: Marble is frequently used for countertops, flooring, wall cladding, and sculptures. It's popular for its elegance and timeless appeal.
• Onyx: Onyx is often used for decorative elements, such as backsplashes, feature walls, vanity tops, and translucent decorative panels. Its unique translucency makes it particularly suitable for backlit applications.

5. Maintenance:

• Marble: Marble requires regular sealing to protect it from staining and etching. It also benefits from careful maintenance to preserve its appearance.
• Onyx: Onyx requires even more meticulous care due to its softness and susceptibility to damage. It may need more frequent sealing and gentle cleaning to avoid scratches and stains.

In summary, marble and onyx are both beautiful natural stones with distinct characteristics. Marble is known for its durability and wide range of colors and patterns, while onyx is valued for its unique translucency and striking appearance. The choice between the two depends on the specific aesthetic and functional requirements of your project, as well as your willingness to maintain and care for the stone over time.