v. undermine, undercut, erode; sap, mine

nm. ore, natural combination of minerals (especially from which a metal or metals can be profitably extracted)

n. minerals

adj. mineral, natural substance belonging to a group of inorganic (often crystalline)

n. mineral, natural substance belonging to a group of inorganic (often crystalline)

v. mine, extract certain substances (minerals, precious stones, etc.)

Mohs Scale of Mineral Hardness