Onyx is a type of cryptocrystalline quartz that is formed in the same way as marble, through metamorphism of limestone or dolomite. However, onyx has distinct characteristics and properties compared to marble. Onyx is known for its striking appearance, with bands or layers of different colors. It is commonly found in shades of black, brown, white, and green, but can also occur in other colors such as red, yellow, and blue. These vibrant colors are due to the presence of impurities and mineral deposits in the stone. The physical properties of onyx include a similar density and hardness to marble. It has a density ranging from 2.5 to 2.7 grams per cubic centimeter and a hardness of around 3 on the Mohs scale. Onyx is also translucent or semi-translucent, allowing light to pass through and creating a unique visual effect. Chemically, onyx is composed of silica and has a similar reaction to acids as marble. It has low solubility in water and requires proper care to prevent damage or staining. In terms of usage, onyx is often used for decorative purposes such as countertops, flooring, and wall cladding. Its unique color patterns and translucency make it a popular choice for creating visually stunning designs. Additionally, onyx is sometimes used for jewelry and ornamental objects due to its beauty and rarity.

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