igneous
Dark, vesicular volcanic rock (likely basalt or scoria)
Vesicular basalt; exact identification is uncertain from the photograph
AI-generated identification · may be incorrectDark gray to black, rough and pitted, with pale mineral grains; likely fine-grained and low-luster. Basaltic minerals typically have Mohs hardness around 5–6; vesicles are gas-bubble cavities, not cleavage.
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Physical properties
Dark gray to black, rough and pitted, with pale mineral grains; likely fine-grained and low-luster. Basaltic minerals typically have Mohs hardness around 5–6; vesicles are gas-bubble cavities, not cleavage.
Formation & geological history
Formed when gas-rich basaltic lava cooled at or near the surface; basaltic volcanism ranges from recent to billions of years old. The image does not establish its age or precise origin.
Uses & applications
Basalt is used as crushed aggregate and building stone; scoria is used in landscaping and lightweight construction. This small, unidentified piece has no clear gem value.
Geological facts
The surrounding light-colored material may be a container or matrix, so the specimen’s setting cannot establish its geology.
Field identification & locations
Look for a dark, fine-grained texture and rounded or irregular cavities; a fresh surface and density test can help distinguish basaltic scoria from other dark rocks. Similar volcanic rocks occur in volcanic regions worldwide.
