igneous
Diorite
Intermediate intrusive igneous rock
AI-generated identification · may be incorrectHardness of 6-7 on the Mohs scale, salt-and-pepper appearance with contrasting black and white minerals, sub-to-phaneritic texture, and specific gravity around 2.8-3.0.
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Physical properties
Hardness of 6-7 on the Mohs scale, salt-and-pepper appearance with contrasting black and white minerals, sub-to-phaneritic texture, and specific gravity around 2.8-3.0.
Formation & geological history
Formed from the slow cooling of intermediate magma beneath the Earth's crust, typically in subduction zone environments.
Uses & applications
Commonly used in construction as crushed stone, dimension stone, and for facing buildings or monuments.
Geological facts
Historically known as 'visorite' and used extensively by ancient civilizations like the Egyptians and Incas for carving due to its high durability.
Field identification & locations
Identify by its distinctive black-and-white speckled look composed mainly of plagioclase feldspar and dark amphibole; found globally in major mountain ranges.
