(from the article `vein`) ...within definite boundaries in unwanted rock or minerals (gangue). The term, as used by geologists, is nearly synonymous with the term lode, as ...
A cleft or crack in the rock material of the earth's crust, filled with mineral matter different fro
A fissure or crack in the earth's crust filled with mineral matter.
A cleft or crack in the rock material of the Earth's crust, filled with mineral matter different from the walls and precipitated therein from aqueous solution.