Figure 2.15. Calcite + Quartz = Wollastonite +CO2 Reaction Rate Data. Reaction rate values (in units of hour-1 for these experiment by Stephen Kridelbaugh (1973) are shown as a function of temperature in degrees Celcius. Notice that the rate constant value increases significantly, from 0.1 to nearly 0.5, over the 150°C temperature range of the experiments. The red line is a fit to the data using the Arrhenius relationship described in the text and in Figure 16.