To dull the luster of a mineral by exposure to air or dirt. Tarnish is a form of corrosion.

A mixture of two elements, at least one of which is a metal, which form a new metal with desired properties.

The smallest unit of an element that retains its properties.

The ability of a mineral to transmit heat, electricity, or sound.

A naturally-occurring combination of two or more elements in a specific ratio. Compounds need a chemical change to separate into their constituent parts.

Gradual chemical destruction of a mineral. Corrosion often, but not always, operates through oxidation. Tarnish is a form of corrosion.

A unit of a mineral that has a symmetrical shape with flat, angled surfaces. The shape arises from an orderly arrangement of the mineral's atoms. Crystals can aggregate to form distinctive overal [..]

The average mass per unit volume of a substance.deposit (mineral)A natural concentration of a mineral in Earth's crust.

The ability of a mineral to be pulled into wire.

(chemical)