: While they rarely stock pure "iron sand," stores like Lowe's or Home Depot carry "Black Diamond" iron silicate, which is often used for sandblasting but serves as a cheap, heavy fill alternative. Specialized Uses (Gardening & Aquariums)

Iron sand is frequently used in weighted vests and sandbags because it is denser than silica sand.

Buying iron sand depends heavily on your intended use, as "iron sand" can refer to high-purity industrial magnetite, decorative aquarium sand, or weighted fill for fitness gear. Industrial & Bulk (Magnetite/Ore)

including 5 lbs of Petrobond sand and a cast iron mold flask for . Holama Ultra-Fine 400 Mesh