Diorite


Diorite is sometimes called 'black granite'.

It is an intrusive igneous rock, which is formed mostly along the margins of continents. It can be formed in large intrusions, or smaller ones such as sills and dikes.





It is a rock similar to granite, however it is darker in colour.

It contains some quartz and feldspar - light-coloured minerals, but much less than do granitoids.

 diorite orbiculaire
 
By Anita Gould via Flickr.com

Instead, it contains a fair bit of dark-coloured minerals such as biotite and hornblende.


 diorite
 By Ian Geoffrey Stimpson via Flickr.com


It is much rarer than granitoids, and it tends to have smaller grain size. It is also similar to gabbro, however its plagioclase is sodium-rich, while the plagioclase of gabbro is rich in calcium.

 diorite rock
 
By euphro via Flickr.com

If the magma with the same composition forms an extrusive igneous rock, it will be andesite.

 diorites
 
By Charlie Phillips via Flickr.com

This rock was used in the ancient Egypt to carve sculptures and build pyramids.













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