Garnet Sand 30/60 Surface Preparation and Water Filtration. Abrasive Garnet is wholesaler of Garnet 80 mesh Water-jet Cutting Brown Garnet Sand Garnet Sand 20/40 garnet 30/60 mesh etc.Physical Properties of Garnet Sand: High specific gravity: 3.8 – 4.2. Weight per cubic foot: 120 – 151 lbs. MOH hardness scale: 7.6 – 8.0. Acid solubility: