**10. Conclusions**

There are several suitable methods for calculating a standard mineral inventory of rock from the full chemical analysis. Among these, the CIPW standard is used, in particular, when the minerals in igneous rocks are particularly fine-grained or not crystallized at all.

The new standard mineral calculations presented here slatenorm and slatecalculation for fine-grained sediments and very low grade and low-grade metamorphic rocks have now been added. The method has already proven itself in assessing roof slates.

In addition to the Kübler index or the reflectance of coal substances with the calculated content of hydro-micas (illite and brammallite), the method also provides information on the degree (grade) of metamorphosis. Further research here seems to be worthwhile in the future.

A detailed comparison of slatenorm and slatecalculation with the standard mineral methods for sedimentary rocks, such as SEDNORM, SEDMIN, and PELNORM, show only a few matches in the results. As far as methodological differences are overcome, the methods for sediments could be appended to it as further calculation steps after the calculation of slatecalculation. The residual water aq should be used as a basis. This requires a new calculation method that has several variants to choose from.
