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what is the definition of andesitic composition ?


Sagot :

0Claudia0
Andesite: 
Is an extrusive igneous, volcanic rock, of intermediate composition, with anphanitic to porphyritic texture. In a general sence, it is the intermediate type between basalt and decite  and ranges from 57  to 63% silicon dioxide as illustrated inTAS diagrams.
Andesite can composition is a rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite.
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