Avacha volcano (Avachinsky volcano; Avachinskaya Sopka), Kamchatka Oblast', Far-Eastern Region, Russia

One of 34 currently active volcanoes in the Eastern Volcanic Front arc segment of Kamchatka. A stratovolcano at 8,965 feet (2,733 meters) high with a permanent snow/ice cap. Composed of a Holocene active volcanic cone nested within a Late Pleistocene - Early Holocene caldera. This volcano is comprised primarily of medium-K, calc-alkaline basalt-andesite, but with subordinate diamond-bearing, high-Mg (14-20% MgO) picrites that host mantle xenoliths.

Refs.:
- Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 539.
- Turner, A., Drummond, M.S., Kepezhinskas, P., and Defant, M.J. (1996) Mineralogy and Geochemistry of Mantle Xenoliths and Host Volcanics of the Avachinsky Volcano, Kamchatka Arc, Russia. 1996 Abstracts with Programs, The Geological Society of America.

- http://en.wikipedia.org/wiki/Avacha_Volcano