Diorite Rock – A Detailed Guide

If you are like most customers going to buy natural stones with any knowledge to differentiate igneous rock from the sedimentary rock, the supplier or stockiest might introduce you to diorite as granite stone.

In the dimension stone industry, any rock with visible interlocking grains of feldspar, the granite is common. However, diorite is falling in between the granite and basalt based on the compositions and properties.

Typical Diorite

Altered Andesite

Of course, diorite and andesite have the same mineral content and occur in the same areas. The difference is grain size and cooling rate during the rock formation process.

• Slow cooling of diorite results into coarse grain size due to large crystals formation with more ion transport. 
• Rapid cooling of andesite, which is forming closer to the surface, results in fine-grained textured rocks.

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