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Alum Shale :: Alum shale () A variety of shale or clay slate, containing iron pyrites, the decomposition of which leads to the formation of alum, which often effloresces on the rock..

Cringle :: Cringle (n.) An iron or pope thimble or grommet worked into or attached to the edges and corners of a sail; -- usually in the plural. The cringles are used for making fast the bowline bridles, earings, etc..

Iron Works :: Iron works () See under Iron, a..

Ochre :: Ochre (n.) 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..

Matte :: Matte (n.) A partly reduced copper sulphide, obtained by alternately roasting and melting copper ore in separating the metal from associated iron ores, and called coarse metal, fine metal, etc., according to the grade of fineness. On the exterior it is dark brown or black, but on a fresh surface is yellow or bronzy in color..

Sympathy :: Sympathy (n.) A tendency of inanimate things to unite, or to act on each other; as, the sympathy between the loadstone and iron..

Minie Ball :: Minie ball () A conical rifle bullet, with a cavity in its base plugged with a piece of iron, which, by the explosion of the charge, is driven farther in, expanding the sides to fit closely the grooves of the barrel..

Wadd :: Wadd (n.) An earthy oxide of manganese, or mixture of different oxides and water, with some oxide of iron, and often silica, alumina, lime, or baryta; black ocher. There are several varieties..

Staurolitic :: Staurolite (n.) A mineral of a brown to black color occurring in prismatic crystals, often twinned so as to form groups resembling a cross. It is a silicate of aluminia and iron, and is generally found imbedded in mica schist. Called also granatite, and grenatite..

Triphylite :: Triphylite (n.) A mineral of a grayish-green or bluish color, consisting of the phosphates of iron, manganese, and lithia..

Iolite :: Iolite (n.) A silicate of alumina, iron, and magnesia, having a bright blue color and vitreous luster; cordierite. It is remarkable for its dichroism, and is also called dichroite..

Helvite :: Helvite (n.) A mineral of a yellowish color, consisting chiefly of silica, glucina, manganese, and iron, with a little sulphur..

Corrugate :: Corrugate (v. t.) To form or shape into wrinkles or folds, or alternate ridges and grooves, as by drawing, contraction, pressure, bending, or otherwise; to wrinkle; to purse up; as, to corrugate plates of iron; to corrugate the forehead..

Polybasite :: Polybasite (n.) An iron-black ore of silver, consisting of silver, sulphur, and antimony, with some copper and arsenic..

Lancet :: Lancet (n.) An iron bar used for tapping a melting furnace.

Sideroxylon :: Sideroxylon (n.) A genus of tropical sapotaceous trees noted for their very hard wood; ironwood.

Blackband :: Blackband (n.) An earthy carbonate of iron containing considerable carbonaceous matter; -- valuable as an iron ore.

Reduce :: Reduce (n.) To bring to the metallic state by separating from impurities; hence, in general, to remove oxygen from; to deoxidize; to combine with, or to subject to the action of, hydrogen; as, ferric iron is reduced to ferrous iron; or metals are reduced from their ores; -- opposed to oxidize..

Chalybite :: Chalybite (n.) Native iron carbonate; -- usually called siderite.

Scutum :: Scutum (n.) An oblong shield made of boards or wickerwork covered with leather, with sometimes an iron rim; -- carried chiefly by the heavy-armed infantry..

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