igneous
Dark, weathered igneous rock (likely basalt)
Basalt; exact identification is uncertain from the photograph
AI-generated identification · may be incorrectDark gray-brown, fine-grained matrix with scattered pale mineral grains and a dull, weathered surface. Basalt is typically Mohs 6, with plagioclase and pyroxene; grain size and composition cannot be confirmed from the image.
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Physical properties
Dark gray-brown, fine-grained matrix with scattered pale mineral grains and a dull, weathered surface. Basalt is typically Mohs 6, with plagioclase and pyroxene; grain size and composition cannot be confirmed from the image.
Formation & geological history
Likely formed when mafic lava cooled at or near Earth’s surface; basalt occurs from ancient volcanic terrains to modern eruptions. The specimen’s age and exact formation setting cannot be determined visually.
Uses & applications
Basalt is used as crushed aggregate, road stone, and building material; this small unpolished piece is mainly suitable for study or collecting.
Geological facts
Basalt is one of Earth’s most common volcanic rocks and also forms much of the ocean floor.
Field identification & locations
Its dark color and fine-grained appearance suggest basalt, but a fresh broken surface or hand-lens inspection would help distinguish it from other dark rocks. Basalt is widespread in volcanic regions worldwide.
