WordNet
mineral vein
n. a layer of ore between layers of rock [syn: vein]
Usage examples of "mineral vein".
Looking up, she saw a cliff with a mineral vein streaking it, and she swerved onto a narrow, little-used road that was no more than two parallel ruts amid the bushes.
So Wes hopped down and walked over to where Ken squatted on one knee, carefully chipping a few small chunks out of a blue mineral vein running irregularly along the cave wall.