Petrographic and Mineralogic Details
All three stages of Chao are mineralogically similar, with minor variations in mafic enclave content. Phenocrysts of Plagioclase, Quartz, hornblende, biotite, and sphene are seen in a friable glassy matrix. The friable nature of the matrix is due to microvesiculation that took place in the lava.
A few things to note, getting to Chao can be difficult. To get to the base of Chao, as with everything on the APVC, 4WD is required. The road that runs to the south of Chao, between Chao and Leon, is washed out in a few places. However, great camping does exist along this road with some amazing views.