igneous
Vesicular volcanic rock (likely scoria)
Scoria, typically basaltic and composed mainly of plagioclase, pyroxene, and iron-rich minerals
AI-generated identification · may be incorrectSmall, rough, porous specimen with dark gray-brown coloring and a dull to slightly earthy luster. Scoria’s hardness is typically about 5–6 on the Mohs scale; its fine-grained groundmass and gas cavities are visible, but crystal structure and density cannot be determined from the image.
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Physical properties
Small, rough, porous specimen with dark gray-brown coloring and a dull to slightly earthy luster. Scoria’s hardness is typically about 5–6 on the Mohs scale; its fine-grained groundmass and gas cavities are visible, but crystal structure and density cannot be determined from the image.
Formation & geological history
Forms when gas-rich basaltic lava cools quickly, trapping bubbles; it is generally a young volcanic rock, though the specimen’s age cannot be identified from appearance alone.
Uses & applications
Scoria is used as lightweight aggregate, landscaping stone, and abrasive material; this small piece has mainly educational or modest collecting value.
Geological facts
Its holes are vesicles left by escaping volcanic gases, making scoria lighter and more porous than many ordinary basalt rocks.
Field identification & locations
Common near basaltic volcanoes and lava fields. The porous texture and dark, lava-like matrix suggest scoria, though other vesicular volcanic rocks can look similar; confirm by examining fresh surfaces and density.
