Physical Properties

1. Color and Texture: Zhangqiu black stone features a deep gray-black color with fine white or gray speckles on the surface. Its texture is natural and unique, conveying a sense of stability and elegance.
2. Density and Hardness: High density, typically ranging from 2.6 to 2.9 g/cm³, hardness up to 6-7 on the Mohs scale, excellent wear resistance.
3. Compressive Strength: The compressive strength typically ranges from 100 to 150 MPa, with some high-quality stones reaching up to 198 MPa, far exceeding industry standards.
4. Water Absorption and Weather Resistance: Low water absorption rate, typically below 0.2%, excellent impermeability; strong weather resistance, able to withstand weathering, corrosion, and discoloration, suitable for various climatic conditions.