In the cement industry clinker, a synthetic material obtained from cla
y and limestone, is the result of a complex industrial process. The na
ture of the resulting phases and their relative proportions in the cli
nker are essential elements for a clear understanding of its chemical
and mechanical properties. Selective dissolution methods enable the mi
neralogical phases to be isolated. They are analysed by diffraction an
d the measurement of the relative areas of the characterstic peaks of
the phases of the clinker, with no internal standard, enables the info
rmation obtained to be related to the expected properties of the final
product. This method of identifying the composition of the clinker pe
rmits a refinement of the results obtained by X-ray fluorescence.