المنصة الرخامية هي أداة قياس دقيقة مصنوعة من الرخام
The marble platform is a precision measuring tool made of marble, also known as a granite plate. It is crafted from high-quality “Jinan Green” stone through mechanical processing and hand-polishing. The main mineral components of the marble platform are pyroxene, plagioclase, a small amount of olivine, biotite, and trace amounts of magnetite. It has a…