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Partaking of iron; containing particles of iron. Boyle.

Containing clay and iron.

A ferruginous hydrate of alumina. It is largely used in the preparation of aluminium and alumina, and for the lining of furnaces which are exposed to intense heat.

paper, esp. coarse wrapping paper, made of unbleached materials. -- Brown spar (Min.), a ferruginous variety of dolomite, in part identical with ankerite. -- Brown stone. See Brownstone. -- Brown stout, a strong kind of proter or malt liquor. -- Brown study, a state of mental abstraction or serious reverie. W. Irvi…

A deposit of pebbles, gravel, and ferruginous sand, in which the Brazilian diamond is usually found.

Ferruginous. [R.]

Decomposed rock, usually reddish or ferruginous (owing to oxidized pyrites), forming the upper part of a metallic vein.

A ferruginous variety of shalerite or zinc blende, nearly black in color.

A ferruginous variety of rutile.

A impure earthy ore of iron or a ferruginous clay, usually red (hematite) or yellow (limonite), -- used as a pigment in making paints, etc. The name is also applied to clays of other colors.

A brickred ferruginous clay used by the ancients for red paint.

Ferruginous quartz, of a blood-red or brownish red color, sometimes with a tinge of yellow.