Decrepitation is usually extremely intense, but at unusually high temperatures given the typically low formation temperature of calcite.
This sample is from the Bou Jaber mine in Tunisia, a small,
hosted karst breccia with Pb, Zn, F and Ba mineralization. Fluid
homogenization data in barite and fluorite indicate a formation
of 90-120 C from hydrocarbon rich source fluids. Calcite and other
have decrepitation peaks ranging from 400 to 800 C which do not reflect