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Cinnabar (mercury sulphide - HgS) is the single most toxic mineral to handle on earth. It is the worldâs main source of mercury and has been mined since Neolithic times. However, when oxidized, this element will produce methyl mercury and dimethyl mercury, two toxic compounds that cause irreparable harm to the nervous systems of children. It is deadly in small concentrations and can be absorbed through the respiratory tract, intestines, or skin.
Borax is a name for several different but similar chemical compounds, of which probably the commonest is sodium decahydrate or sodium borate. They all contain sodium and boron. Borax is toxic enough to kill ants, fleas and cockroaches and other unwanted insect life. Its effects upon the environment are not yet well documented but it can be toxic to aquatic life if too concentrated. It is regarded by the Australian government as a low threat to the environment but a moderate threat to health.