igneous
Diorite
Intermediate plutonic igneous rock
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale; mottled black and white or green-gray color; sub-to-euhedral crystal structure with a vitreous to dull luster.
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Physical properties
Hardness of 6-7 on Mohs scale; mottled black and white or green-gray color; sub-to-euhedral crystal structure with a vitreous to dull luster.
Formation & geological history
Formed from the slow cooling of intermediate magma beneath the Earth's crust, commonly in subduction zone environments.
Uses & applications
Extensively used in construction, as crushed stone for road bases, and historically for ancient Egyptian architecture like statues and vessels.
Geological facts
Often referred to as 'granodiorite' or 'german granite' by builders, diorite is exceptionally tough and resistant to weathering.
Field identification & locations
Identified by its salt-and-pepper appearance with roughly equal proportions of plagioclase feldspar and dark minerals like hornblende or biotite.
