Category: M

  • Melting point

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    All metals, except mercury (Hg), are solids at room temperature and normal atmospheric pressure. When metals are heated they will turn from a solid into a liquid state. The melting point of a metal refers to the temperature at which this happens.

  • Marcasite jewellery

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    Marcasite jewellery are inexpensive, usually mass-produced silver jewellery with faceted pyrite (not actually the mineral marcasite) glued onto it. The pyrite gems are flat-bottomed so that it can easily be glued; pyrite is too brittle to set. The silver is oxidized black in places, which, together with the steel-like glint of the pyrite, results in…