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Guaranteed tours:
4-17 Feb: Desert, salt and volcanoes - Danakil desert (Ethiopia)
5-9 Mar: Colima Volcano Special - Mexico
12-18 Mar: Kilauea Volcano Special - Big Island, Hawaiʻi
6-21 May: From Krakatau to Bali - Java (Indonesia)
13-21 May: From Stromboli to Etna - Eolian Islands + Etna volcano (Italy)
20-27(28) May: Fascination Volcano - Santorini Island (Greece)
29 May - 3 Jun: Aegean's Hidden Gem: Isle of Milos - Milos Island (Greece)
3-18 Jun: From Krakatau to Bali - Java (Indonesia)
4-11 Jun: Nyiragongo Lava Lake & Mountain Gorillas - DR Congo + Rwanda
8-23 Jul: From Krakatau to Bali - Java (Indonesia)
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Random pictures

Illustrated Volcano Glossary

dacite

Volcanology
Dacite is an igneous, volcanic rock with a high iron content found at many lava-domes.
Dacite (pronounced /deɪsaɪt/) is an igneous, volcanic rock with a high iron content. It is intermediate in compositions between andesite and rhyolite, and, like andesite, it consists mostly of plagioclase feldspar with biotite, hornblende, and pyroxene (augite and/or enstatite). It has an aphanitic to porphyritic texture with quartz as rounded, corroded phenocrysts, or as an element of t... -> See whole entry

debris avalanche

Volcanology
A sudden collapse of volcanic material from an unstable side of a volcano. Debris avalanches are a particularly violent type of pyroclastic flows (in its broader meaning).

Related keywords (1):

pyroclastic flow

diorite

Volcanology
Diorite sample (image: Michael C. Rygel via Wikimedia Commons)
Diorite sample (image: Michael C. Rygel via Wikimedia Commons)
Diorite is an intrusive igneous rock of intermediate silica content (53-63%). It is the equivalent of its extrusive (volcanic) counterpart andesite.
Diorite is composed principally of the silicate minerals plagioclase feldspar (typically andesine), biotite, hornblende, and/or pyroxene. The chemical composition of diorite is intermediate between gabbro and granite. -> See whole entry

Related keywords (2):

andesite - granite

 

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