igneous
Diorite
Plutonic igneous rock
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, salt-and-pepper appearance with black biotite/hornblende and white plagioclase feldspar, vitreous luster, coarse-grained phaneritic texture.
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Physical properties
Hardness 6-7 on Mohs scale, salt-and-pepper appearance with black biotite/hornblende and white plagioclase feldspar, vitreous luster, coarse-grained phaneritic texture.
Formation & geological history
Formed from the slow cooling of intermediate magma beneath Earth's surface, typically in continental subduction zone settings.
Uses & applications
Used widely as a dimension stone in construction, decorative facing, paving, and occasionally as crushed stone for road bases.
Geological facts
Ancient Egyptian builders frequently used diorite for vessels and statues due to its extreme toughness and resistance to weathering.
Field identification & locations
Identify by its distinct contrasting black and white speckled appearance without the quartz grains found in granite. Found globally in orogenic belts.
