igneous
Coarse-grained dark igneous rock, probably diorite
Diorite (tentative; exact identification requires closer examination)
AI-generated identification · may be incorrectDark gray to black with scattered light-colored grains and a coarse, interlocking texture. Diorite typically contains plagioclase feldspar and hornblende or other dark minerals; hardness is about 6–7 Mohs, with a granular crystalline structure and no prominent cleavage in the whole rock.
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Physical properties
Dark gray to black with scattered light-colored grains and a coarse, interlocking texture. Diorite typically contains plagioclase feldspar and hornblende or other dark minerals; hardness is about 6–7 Mohs, with a granular crystalline structure and no prominent cleavage in the whole rock.
Formation & geological history
Diorite forms when magma cools slowly underground, allowing visible crystals to grow. Such intrusive rocks occur in many geological settings and range widely in age.
Uses & applications
Used as crushed stone and aggregate, dimension stone, and occasionally for decorative or sculptural work.
Geological facts
The contrasting pale and dark minerals are characteristic of many intrusive rocks, though similar-looking gabbro or granodiorite cannot be ruled out from this image.
Field identification & locations
Look for interlocking visible crystals and identify the pale feldspar and dark minerals; mineral proportions distinguish diorite from related rocks. Found in intrusive rock bodies worldwide.
