What is the importance of metals in medicine?

Platinum: Platinum based compounds have been shown to specifically effect head and neck tumors.

Gold: Gold salt complexes have been used to treat rheumatoid arthritis. The gold salts are believed to interact with albumin and eventually be taken up by immune cells, triggering anti-mitochondrial effects and eventually cell apoptosis.

Lithium: Li2CO3 can be used to treat prophylaxis of manic-depression.

Zinc: Zinc can be used topically to heal wounds. Zn2+ can be used to treat the herpes virus.

Silver: Silver has been used to prevent infection at the burn site for burn wound patients.

Platinum, Titanium, Vanadium, Iron: cis DDP (cis-diaminedichoroplatinum), titanium, vanadium, and iron have been shown to react with DNA specifically in tumor cells to treat patients with cancer.

Gold, Silver, Copper: Phosphine ligand compounds containing gold, silver, and copper have anti-cancer properties.

Lanthanum: Lanthanum Carbonate often used under the trade-name Fosrenol is used as a phosphate binder in patients suffering from Chronic Kidney disease.

Bismuth: Bismuth is used as an antacid.

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).