Quartz.
Quartz.
Phosphate rock.
Natural mica.
Silica sand.
Silica Sand.
Phosphate Rocks.
Gypsum powder.
Rock phosphate.
Silica sand.
Phosphate rock 24% t0 30% min p2o5 , phosphate rock.
Gypsum.
Egyptian rock phosphate.
White silica sand.
Rock phosphate.
Natural mica.
Rock phosphate.