Rock phosphate

We are offering rock phosphate from Egypt, different types P2O5 25, 26, 28, and 30%.
rock phosphate is a non-detrital sedimentary rock which contains high amounts of phosphate bearing minerals. The phosphate content of phosphorite is at least 15 to 20%, which is a large enrichment over the typical sedimentary rock content of less than 0.2%. The phosphate is present as fluorapatite ca5 (po4)3f (cfa) typically in cryptocrystalline masses (grain sizes < 1 μm) referred to as collophane.[1] it is also present hydroxyapatite ca5(po4)3oh, which is often dissolved from vertebrate bones and teeth, whereas fluorapatite can originate from hydrothermal veins. Other sources also include chemically dissolved phosphate minerals from igneous and metamorphic rocks. Phosphorite deposits often occur in extensive layers, which cumulatively cover tens of thousands of square kilometres of the earth's crust.