igneous
Gabbro or Diorite with Felsic intrusion
Mafic to intermediate intrusive igneous rock with felsic vein/inclusion
AI-generated identification · may be incorrectHardness 6-7, mottled dark green/black and light gray/white, crystalline texture, dull to shiny luster when wet.
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Physical properties
Hardness 6-7, mottled dark green/black and light gray/white, crystalline texture, dull to shiny luster when wet.
Formation & geological history
Formed by slow cooling of magma deep underground. The contrasting colors indicate different mineral compositions, likely a mafic host rock with a felsic intrusion or mixing.
Uses & applications
Often used as crushed stone for construction, road base, or sometimes polished for dimension stone.
Geological facts
The sharp contact between the dark (mafic) and light (felsic) portions shows a distinct geological event where one magma intruded into another, or a xenolith.
Field identification & locations
Identify by its phaneritic (coarse-grained) texture and the stark contrast between the dark ferromagnesian minerals and light feldspars. Found in areas with intrusive igneous activity.
