Petrography and Genesis of Nahan Phosphorite Himachal Pradesh-Northwest Himalayas

Nahan Phosphorite is classified into three types: fragmental phosphorite, pelletal phosphorite and nodular phosphorite. X-Ray Diffraction studies show that francolite (carbonate fluorapatite) constitutes the main phosphate mineral. It is concluded that the Nahan Phosphorite accumulated in shallow marine waters where euxinic conditions prevailed locally.