Fluorite deposits occur in a variety of geologic environments throughout the globe. It may occur as the main or only economically recoverable ore mineral in deposits or may present as the accessory gangue minerals with other ores. It is therefore necessary to understand various genetic types of the fluorite deposit. The present paper synthesises the information of some of the known fluorite mineralisation from the world so that an understanding of them can help in establishing reliable criteria for further search of fluorite deposit. On the basis of a combination of geological background information and fluorite geochemistry, a new classification scheme is proposed.

The pegmatites of Kudi valley, Paddar area are mineralogically characterised by the presence of Na-plagioclase, quartz, perthite, tourmaline, biotite with minor amount of muscovite, sillimanite, and garnet. The biotite mineral from the pegmatites show higher Al2O3, FeO, K2O, moderate SiO2, MgO, Cr2O3, TiO2, F; and low Na2O, CaO, MnO, Cl concentration. They are classified as siderophyllite type. The geochemical signature of biotite indicates the peraluminous nature of the pegmatitic melt generated from the melting of continental crust in the syn-tectonic collision setting. They are mostly magmatic; however, some of them also show reequilibrated nature. The biotite crystallised at high temperature (600°C - 700°C) at low oxygen fugacity . 3Mg↔2Al and coupled substitution between LiIV+SiIV=(Fe2+)IV played an important role during the crystallisation of the studied biotite.