mineral

Although there are dozens of different types of gems, among the best known and most important are diamond, ruby and sapphire, emerald and other gem forms of the mineral beryl, chrysoberyl, tanzanite, tsavorite, topaz and jade.

O'er whom his very madness, like some ore / Among a mineral of metals base, / Shows itself pure;

...Thou hast... / Abused her delicate youth with drugs or minerals...