omphacite sand, natural color sand can be used as abrasive etc
Detailed introduction to omphacite sand:
Omphacite Sand
1. Chemical analysis
SiO2 54-56
Al2O3 12-14
Fe2O3 3-4
CaO 1-2
MgO 11-13
TiO2 0.4-0.5
2 Physical properties
Colour : dard green
Special gravity: 3.2-3.4
Hardness : 5.0-6.0 Mohs