igneous
Banded Igneous Dike Rock
Intrusive igneous rock with felsic/mafic banding
Hardness around 6-7 on Mohs scale; colors range from dark grey/black to white and tan due to mineral banding; vitreous to dull luster; cryptocrystalline to phaneritic texture.
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Physical properties
Hardness around 6-7 on Mohs scale; colors range from dark grey/black to white and tan due to mineral banding; vitreous to dull luster; cryptocrystalline to phaneritic texture.
Formation & geological history
Formed when molten magma intrudes into pre-existing rock fractures and cools, often creating contrasting banded patterns through fractional crystallization and successive injection events.
Uses & applications
Used primarily for educational and geological study, landscape stones, or as a specimen in rock collections.
Geological facts
Banded intrusions often record multiple pulses of magma injection from deeper crustal or mantle sources over thousands of years.
Field identification & locations
Can be identified in the field by distinct, contrasting parallel mineral bands cutting across country rock. Found worldwide in mountainous regions and areas with ancient volcanic activity.
