igneous
Porphyritic Basalt or Snowflake Basalt
Aphanitic igneous rock with plagioclase phenocrysts
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale. Features a dark brown to black vesicular matrix with contrasting white plagioclase feldspar crystal inclusions. Luster is dull to sub-vitreous.
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Physical properties
Hardness of 6 on the Mohs scale. Features a dark brown to black vesicular matrix with contrasting white plagioclase feldspar crystal inclusions. Luster is dull to sub-vitreous.
Formation & geological history
Formed through a two-stage cooling process in volcanic environments, where slow-growing crystals formed deep underground before a rapid eruption cooled the surrounding matrix.
Uses & applications
Used primarily in landscaping, decorative stone, and educational geological collections.
Geological facts
The distinct light spots are called phenocrysts, which give the rock a spotted or speckled appearance resembling snowflakes or fossils.
Field identification & locations
Identify by its dark, pitted vesicular texture contrasted with embedded white crystal laths. Commonly found near volcanic regions and riverbeds.
