The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
Radially arranged nepheline crystal aggregates can be found in some of Nyiragongo´s lavas. The very low silica content of the volcano´s magmas is the reason why they have such a low viscosity, making them some of the fastest moving and hence deadliest lavas on earth. Minerals crystallising from such magmas are hence also silica poor, for example the white feldspathoids shown in this image. (Photo: Ingrid Smet)
Colima volcano photos: This beautiful stratovolcano in western Mexico is one of the most active volcanoes on the American continents. It is known for its often spectacular explosions and sometimes glowing avalanches.
Gorely volcano photos: Gorely is a young and very active shield volcano in southern Kamchatka. It is one of Kamchatka's easiest volcanoes to climb and offers stunning views into vast craters and the surrounding landscape.
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