There are many rock types identified at Kone and they are divided into five main groups, trachytes, comenditic rhyolites, ignimbrites, pumices, syenite inclusions and basalts. Trachytes and comenditic rhyolites form the main volume of the rock in the Complex. The ignimbrites have formed massive green sheets ranging in thickness from 15 cm to 25 m. The pumice deposits over the ground are common within Kone's Volcanic Complex and range in thickness from 50 cm to 20 m. Most of the pumice is found interlocked with the ignimbrites. There have been three basalt lava types identified at Kone, aphyric basalt, olivine basalt and a third basalt which contains large phenocrysts of olivine, augite and plagioclase. These different rock types provide evidence for different eruptive phases. Kone is unusual due to the number of calderas in the Volcanic Complex, Fentale contains only one calderas in comparison.