Cinder Cone is a -high volcanic cone of loose scoria. Volcanic rocks of Honolulu Volcanics include agglomerates, breccia, breccia-tuffs, scoria bombs and tuffs. Rocks largely composed of volcanic glass include obsidian, scoria and pumice. The field consists of volcanic maars and basaltic scoria cones. Layers of lava, ash, scoria and pumice make up the volcanic peak. Scoria differs from pumice in being denser. Volcanic activity later resumed, producing scoria cones and lava flows atop the older eroded shield. Some basaltic scoria was also deposited during this phase. Thick scoria beds were produced by the fragmentation of lava flows. The volcano is high and features both blocky lava flows and scoria flows. A colloquial term for scoria is cinder. The caldera itself contains a scoria cone. It contains volcanic caves and about 26 scoria cones. Consequently, the tuff has a bowl-like crater unfilled by scoria or lava. A small lava and scoria cone marks the highest point.