igneous
Quartz-veined dark volcanic rock (likely basalt)
Basalt with a quartz-rich vein; exact identification requires testing
AI-generated identification · may be incorrectDark gray, fine-grained host rock with a pale pink, sugary-textured mineral filling a fracture. The host is likely basalt (hardness about 6); the vein may be quartz (Mohs 7), but its pink color and texture are not diagnostic. Specific gravity and crystal structure cannot be determined from the photo.
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Physical properties
Dark gray, fine-grained host rock with a pale pink, sugary-textured mineral filling a fracture. The host is likely basalt (hardness about 6); the vein may be quartz (Mohs 7), but its pink color and texture are not diagnostic. Specific gravity and crystal structure cannot be determined from the photo.
Formation & geological history
Likely formed when basaltic lava cooled, then mineral-rich fluids deposited material in a crack. The specimen’s age and the vein mineral cannot be established from appearance alone.
Uses & applications
Comparable rocks are mainly collected or used as decorative specimens; basalt is widely used as aggregate and building stone.
Geological facts
The pale vein may be quartz or another fracture-filling mineral; a scratch test and closer examination of crystal faces can help distinguish it.
Field identification & locations
Look for a hard, fine-grained dark matrix cut by a contrasting vein. Basalt is common in volcanic regions worldwide; the pictured specimen appears hand-sized and unpolished.
