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Newly measured viscosities of a low H 2 O-content granitic melt and a low H 2 O-content albitic melt have been combined with viscosity data from the literature to create two new models for the calculation of granitic melt viscosities at crustal pressures and temperatures between 700 and 900 °C; one model is purely empirical, and the other is based on config­urational entropy theory. When the molecular weight of the anhydrous melt is calculated on the basis of eight O atoms, or assumed to be 260 gram formula weight (gfw), and the total H 2 O concentration is expressed by its mole fraction, the viscosity, η, of per- and metaluminous granitic melts, ~ 70-76 wt% SiO 2 , can be calculated from the following empirical equations: For X tot  H₂O  ≤ 0.25,

Granitic melt viscosities: Empirical and configurational entropy models for their calculation