Dacite


Dacite is an igneous rock.

It has a composotion between andesite and rhyolite.





It is an extrusive igneous rock, but it can also be found in small intrusions.

It is a fine grained rock, but porphyritic varieties are also common.

 dacite
 By docentjoyce via Flickr.com


The large minerals, phenocrysts, are usually quartz and feldspar.

Other minerals include pyroxene, hornblende and biotite.

 dacites
 
By randomduck via Flickr.com

It is often pink or greyish in colour.

It is often found with andesite on continental margins, and with rhyolite near continental volcanoes.













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