igneous
Diorite
Intermediate intrusive igneous rock
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, salt-and-pepper appearance with black and white crystals, sub-to-phaneritic texture, specific gravity of 2.8-3.0.
Identified More igneous →
Explore Diorite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6-7 on Mohs scale, salt-and-pepper appearance with black and white crystals, sub-to-phaneritic texture, specific gravity of 2.8-3.0.
Formation & geological history
Formed from the slow cooling of intermediate magma beneath the Earth's surface, typically in subduction zone settings.
Uses & applications
Widely used in construction, as crushed stone for road aggregate, and as a decorative building and dimension stone.
Geological facts
Known historically as 'arpakite' in ancient Egypt, diorite was frequently used for statues and vases due to its durability.
Field identification & locations
Identified easily by its contrasting black biotite/hornblende and white plagioclase feldspar grains; found globally in major mountain chains.
