material derived from a vein, often used to refer to substances found in veins (like minerals or fluids)

रेशे से निकला हुआ पदार्थ

English Usage: The miner extracted various veinstuff from the rock.

Hindi Usage: खुदाई करने वाले ने चट्टान से विभिन्न रेशों का पदार्थ निकाला।