Containing or consisting of silica; of the nature of silica. Of mineral substances.

Containing or yielding gold; literal and figurative.

Yielding or producing silex or silica.

= silicated, adj.

Abounding in or consisting largely of talc.

Alum-bearing, yielding alum. In later use also: containing alumina.

Coated or impregnated with silex or silica.

Of rock-masses: Bearing or containing veins of metal or quartz.

Producing tin. Also applied to enamels or glazes containing tin, and pottery treated with these.

= aluminiferous, adj.

Containing or yielding quartz.

Containing a high proportion of quartz and feldspar.

Impregnated with tin.

Made tinny or like tin; impregnated with tin; in quot. 1794 depreciative.

Geology. Of igneous rock: relatively rich in silica. Cf. acid, adj. 4a.

applied to a rock which was originally an impure limestone or dolomite and has been thermally metamorphosed, with the result that the lime has…

= peralkaline, adj.

Geology. Of a mineral or rock: containing an appreciable or a greater than average quantity of potassium, often as compared with sodium. Also…

Geology. Of a mineral or rock: containing an appreciable or a greater-than-average quantity of sodium, often as compared with calcium or potassium…

Containing both sodium and potassium in appreciable quantities.

Of or pertaining to such light-coloured minerals as the feldspars, the feldspathoids, quartz, and muscovite, or to rocks containing a high…

Of an igneous rock: containing a high proportion of soda and potash; (now) spec. containing a greater proportion of soda and potash combined than…

Of an igneous rock: containing a higher proportion of alumina than of soda and potash combined. Cf. peralkaline, adj.