**7. Conclusions**

Kone silicic eruptives are characterized by the phenocryst assemblage of alkali feldspar (anorthoclase and sanidine), quartz, hedenbergite, aenigmatite and fayalite, accompanied by rare ilmenite and apatite. The existence of aenigmatite is a typical feature of the peralkaline silicic rocks. We conclude that the alkali feldspar + quartz + hedenbergite + aenigmatite + fayalite assemblage is essentially restricted to the mildly peralkaline rhyolite (comendite) as hedenbergite appears to cease crystallizing in strongly peralkaline rhyolite (pantellerite), generally coinciding with the crystallization of aegirine or aegirine-augite.

## **Acknowledgements**

Funding has been provided by CNRS (Centre National des Recherches Scientifiques, France). We are grateful to the School of Earth Sciences of Addis Ababa University for logistic support.

*Mineralogy of Peralkaline Silicic Volcanics: Information from Kone Volcano, Ethiopian Rift Valley DOI: http://dx.doi.org/10.5772/intechopen.102677*
