igneous
Basalt with Amygdules
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale. Displays dark grey to brownish coloring with secondary mineral infillings visible as lighter spots.
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Physical properties
Hardness of 6 on the Mohs scale. Displays dark grey to brownish coloring with secondary mineral infillings visible as lighter spots.
Formation & geological history
Formed from the rapid cooling of magnesium- and iron-rich lava flows at the Earth's surface.
Uses & applications
Used in construction, aggregate, and occasionally as a decorative or lapidary specimen.
Geological facts
Vesicles in the rock form when volcanic gases escape, which are later filled by secondary minerals like quartz or calcite.
Field identification & locations
Identify in the field by its fine-grained dark matrix interspersed with distinct rounded mineral nodules.
