igneous
Dark fine-grained rock, possibly basalt
Likely basalt; exact identification is uncertain from the low-resolution image.
AI-generated identification · may be incorrectDark gray to black, fine-grained and dull; likely composed mainly of plagioclase and pyroxene, with Mohs hardness around 5–6. Individual crystals and cleavage are not distinguishable in the image.
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Physical properties
Dark gray to black, fine-grained and dull; likely composed mainly of plagioclase and pyroxene, with Mohs hardness around 5–6. Individual crystals and cleavage are not distinguishable in the image.
Formation & geological history
If basalt, it formed when mafic lava cooled rapidly at or near Earth’s surface; its age and specific formation setting cannot be determined from the image.
Uses & applications
Basalt is widely used as crushed aggregate, road stone, and building stone; this specimen appears unworked and has no evident gem value.
Geological facts
Basalt is among Earth’s most common volcanic rocks and also forms much of the ocean floor.
Field identification & locations
The dark, compact appearance is consistent with basalt, but the image does not show diagnostic texture clearly enough to confirm it; fresh broken surfaces and a close-up would help distinguish it from other dark rocks.
