Difference between revisions of "Dacite"
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| − | [[Image:Dacite.jpg|thumb|300px|Close view of dacite lava from the May 1915 eruption of Lassen Peak, California]]'''Dacite''' [[lava]] is most often light gray, but can be dark gray to black. Dacite lava consists of about 63 to 68 percent [[silica]] (<math>SiO_2</math>). Common minerals include plagioclase feldspar, pyroxene, and amphibole. Dacite generally erupts at temperatures between 800 and 1000°C. It is one of the most common rock types associated with enormous Plinian-style eruptions. When relatively gas-poor dacite erupts onto a volcano's surface, it typically forms thick rounded lava flow in the shape of a dome. | + | [[Image:Dacite.jpg|thumb|300px|Close view of dacite lava from the May 1915 eruption of Lassen Peak, California]]'''Dacite''' [[lava]] is most often light gray, but can be dark gray to black. Dacite lava consists of about 63 to 68 percent [[silica]] (<math>SiO_2</math>). Common minerals include plagioclase feldspar, pyroxene, and amphibole. Dacite generally erupts at temperatures between 800 and 1000°C. It is one of the most common rock types associated with enormous Plinian-style eruptions. When relatively gas-poor dacite erupts onto a volcano's surface, it typically forms thick rounded lava flow in the shape of a dome. Outside the United States, this type of lava is generally known as Plinial Lava. |
== Sources == | == Sources == | ||
Revision as of 03:13, August 31, 2007
Dacite lava is most often light gray, but can be dark gray to black. Dacite lava consists of about 63 to 68 percent silica (
). Common minerals include plagioclase feldspar, pyroxene, and amphibole. Dacite generally erupts at temperatures between 800 and 1000°C. It is one of the most common rock types associated with enormous Plinian-style eruptions. When relatively gas-poor dacite erupts onto a volcano's surface, it typically forms thick rounded lava flow in the shape of a dome. Outside the United States, this type of lava is generally known as Plinial Lava.
