igneous
Diorite
Intermediate plutonic igneous rock
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, salt-and-pepper appearance with black and white crystals, sub-to-phaneritic texture, specific gravity 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 6-7 on Mohs scale, salt-and-pepper appearance with black and white crystals, sub-to-phaneritic texture, specific gravity 2.8-3.0.
Formation & geological history
Formed from the slow cooling of intermediate magma beneath the Earth's crust, typically in subduction zone settings.
Uses & applications
Used extensively as crushed stone for construction, road aggregate, and polished dimensional building stone.
Geological facts
Historically known as 'orbitite' in ancient Egypt, diorite was frequently used for statues and vases due to its durability.
Field identification & locations
Identify in the field by its coarse-grained mix of plagioclase feldspar and dark amphibole or biotite without quartz.
