Esp. of a mineral: occurring in the form of a vein or veins; distributed in veins.

Mineralogy and Geology. Having the form of a nodule; occurring as nodules.

Designating a metal, mineral, or rock occurring in a vein or veins, as vein gold, vein granite, vein quartz, etc.

Mining. (See quot. 1886) Cf. stray, adj.

Mining. (See quot. 1886.)

Of an ore or mineral: deposited or enriched by precipitation from mineral-rich water percolating downwards; involving or involved in deposition…

Geology. Of, relating to, or designating mineral and ore deposits formed by hydrothermal action at intermediate temperature and pressure.

Having the form of a pod; (Geology) designating a long or thick pod-shaped deposit of a mineral, esp. chromite.

applied to mineral deposits formed by hydrothermal action at high temperatures but at a shallow depth.