The late-Proterozoic Homrit Waggat granite complex contains Sn-F bearing quartzmuscovite greisen zone as well as fluorite veins. Fluid inclusions study in quartz and fluorite from greisen indicates the same fluid inclusion types. Fluid inclusions trapped in greisenized granite are represented mainly by two–phase (L+V) aqueous and immiscible three-phase (H2O-CO2) inclusions which probably trapped from one homogeneous fluid (H2O˗CO2˗NaCl) due to immiscibility process. Two-phase aqueous inclusions (type 1) are represented by three generations (subtype 1a, subtype 1b and subtype 1c). Immiscible three-phase inclusions are conformable and coexisting with the three generations of aqueous inclusions. Based on paragenetic distribution of the inclusions, subtype 1a and subtype 2a are primary, subtype 1b and 2b are pseudosecondary, while subtype 1c and 2c are secondary distributed. Microthermometric results for the first generation (subtypes 1a and 2a) inclusions revealed that the greisenization probably starts at temperature > 330°C. Greisenization as well as cassiterite deposits probably continuous with decreasing temperature (330°C - 270°C) and pressure estimated between 1.4 kb and 0.65 kb. Subtypes 1b and 2b as well as fluorite deposits may be taken place due to dilution at temperature and pressure (260°C - 180°C and 536 - 441 bars). The latest fluid generation is represented by high saline poly-phase, two-phase (subtype 1c) and mono-phase aqueous inclusions. Such coexistence of inclusions is an evidence of boiling. In fluorite veins only primary two-phase aqueous inclusions were observed. The minimum pressures of trapping are between 181 and 212 bars at temperatures between 140°C and 200°C