White Mini Stones 25kg

The image appears to show a bag of marble chips or quartz grits sand, which are granular materials used in various applications. 
Marble chips are crushed and graded pieces of marble, often used for decorative purposes in landscaping, aquariums, and terrazzo flooring. 
Quartz grits sand are crushed, graded forms of quartz (SiO₂) used in industrial processes, construction, water filtration, and glass manufacturing. 
Both are available from manufacturers and suppliers specializing in construction materials, landscaping supplies, or industrial minerals.