Any of certain minerals or precious stones spotted or streaked with red, or red in colour, formerly used medicinally in the treatment of…

Native sesquioxide of iron (Fe2O3), an abundant and widely distributed iron ore, occurring in various forms (crystalline, massive, or granular); in…

A low-quality form of iron ore, presumably yellowish in colour, which is unsuitable for smelting. Cf. redshire, adj.

A variety of red ochreous iron-ore used for marking sheep, stone, timber, etc.; ruddle. Also, the red mark made with this on sheep, etc.

English regional (west midlands and northern). A superior kind of iron ore found as concretions.

an iron ore found in the Forest of Dean (see quots.).

specular iron ore; cf. glance, n.2

specular iron (also iron ore), haematite, esp. the brilliant crystalline form of this.

(a) an ore of lead with a ‘steel-grain’; (b) siderite or native ferrous carbonate.

More fully oligist iron. Haematite.

a dark-coloured clayey stratum of iron ore occurring in the coal measures (esp. in Scotland) and containing sufficient carbonaceous matter for…

Mining. Iron ore containing nodules of iron carbonate. Obsolete. rare.

Of the nature of or resembling spath or spar; abounding in, consisting of, spar; foliated or lamellar… spathose iron, spathose iron-ore, spathose ore…

A secondary iron mineral of variable composition based on amorphous hydrous ferric arsenate, occurring as pale grey, yellowish, or reddish to dark…

= siderite, n.1 6.

A diamond; †micaceous iron ore (quot. 1835). Also, blink klip.

A mineral of the cubic crystal system consisting of a hydrated arsenate of iron and potassium (often also containing other elements, esp. barium or…

‘A variety of siderite occurring in spherical concretions’ (Chester).

a fossiliferous form of haematite.

A name given to various kinds of soft gold-bearing iron ore found in Brazil (see quot. 1963).

A variety of magnetic iron ore found near Vignes in the department of the Moselle, France.

Mineralogy. Native ferrous carbonate, a brown mineral occurring in a wide range of esp. sedimentary rocks, and sometimes forming lustrous…

A synonym of siderite, n.1

= needle-ironstone n.

a native hydrated oxide of iron, occurring in needle-shaped or fibrous crystals, or as an ochre, of a yellow, brown, or reddish colour.

= specular iron ore at specular, adj. 3b.

(a) (more fully copper pitch ore) a dark brown ore of copper containing chrysocolla and limonite; also called pitchy copper ore; (b) = pitchblende, n.…

Geology. More fully minette ironstone, minette ore. A low-grade oolitic iron ore found mainly in Luxembourg and Lorraine, France.

A type of chert used as an iron ore in parts of North America.