Virtual Collection

Igneous Rock samples

Igneous rocks fall in to two broad categories, extrusive (volcanic) and intrusive (dykes and sills).

   Volcanic samples are found here.

   Intrusive samples are found here. 

Alternatively we can group igneous rocks by composition, for instance gabbro and basalt ave the same composition, but crystallize in different environments. 
   Gabbro and basalt
   Granite and rhyolite
   Diorite  and andesite



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