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KINNUNEN, KARI A., 1989. Determination of total contents of fluid inclusions in quartz using modal analysis: Examples from Proterozoic rocks and ore deposits in Finland. Bull. Geol. Soc. Finland 61, Part 2, 197—208. A modified linear measurement procedure following Rosiwal's method to determine the total volume contents of fluid inclusions in minerals is described. The contents were determined from quartz crystals and grains in 13 Proterozoic rock and ore specimens from Finland. The quartz contained primary, pseudo-secondary and secondary fluid inclusions with five main filling types identified with optical methods, a crushing stage and heating/freezing runs. In hydrothermal quartz crystals (smoky quartz) the fluid inclusion contents were high, from 1.070 to 1.661 volume percent, whereas in metamorphic and magmatic quartz and in quartz veins the total contents ranged from 0.028 to 0.917 volume per cent. A high positive linear correlation, r = 0.915, exists between the average intercept length and total contents of inclusions in the quartz specimens studied. The mean intercept lengths of fluid inclusions in metamorphic and magmatic rock-forming quartz were exceedingly small, ranging from the limit of resolution of the optical system used up to 3.13 microns. Practical applications of the determinations of fluid inclusion contents to the purity evaluation of mineral raw materials, to the estimation of the polishing properties of the smoky quartz used as gem material and to fluid-rock interactions in connection with nuclear waste site studies in crystalline bedrock are briefly discussed.