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Brat :: Brat (n.) A thin bed of coal mixed with pyrites or carbonate of lime.

Thallium :: Thallium (n.) A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7..

Millerite :: Millerite (n.) A sulphide of nickel, commonly occurring in delicate capillary crystals, also in incrustations of a bronze yellow; -- sometimes called hair pyrites..

Lav/sium :: Lav/sium (n.) A supposed new metallic element. It is said to have been discovered in pyrites, and some other minerals, and to be of a silver-white color, and malleable..

Ampelite :: Ampelite (n.) An earth abounding in pyrites, used by the ancients to kill insects, etc., on vines; -- applied by Brongniart to a carbonaceous alum schist..

Pyrrhotite :: Pyrrhotite (n.) A bronze-colored mineral, of metallic luster. It is a sulphide of iron, and is remarkable for being attracted by the magnet. Called also magnetic pyrites..

Pyritiferous :: Pyritiferous (a.) Containing or producing pyrites.

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..

Mispickel :: Mispickel (n.) Arsenical iron pyrites; arsenopyrite.

Magistral :: Magistral (n.) Powdered copper pyrites used in the amalgamation of ores of silver, as at the Spanish mines of Mexico and South America..

Firestone :: Firestone (n.) Iron pyrites, formerly used for striking fire; also, a flint..

Pyritize :: Pyritize (v. t.) To convert into pyrites.

Chalcopyrite :: Chalcopyrite (n.) Copper pyrites, or yellow copper ore; a common ore of copper, containing copper, iron, and sulphur. It occurs massive and in tetragonal crystals of a bright brass yellow color..

Brass :: Brass (n.) Lumps of pyrites or sulphuret of iron, the color of which is near to that of brass..

Copperas :: Copperas (n.) Green vitriol, or sulphate of iron; a green crystalline substance, of an astringent taste, used in making ink, in dyeing black, as a tonic in medicine, etc. It is made on a large scale by the oxidation of iron pyrites. Called also ferrous sulphate..

Sulphur :: Sulphur (n.) A nonmetallic element occurring naturally in large quantities, either combined as in the sulphides (as pyrites) and sulphates (as gypsum), or native in volcanic regions, in vast beds mixed with gypsum and various earthy materials, from which it is melted out. Symbol S. Atomic weight 32. The specific gravity of ordinary octohedral sulphur is 2.05; of prismatic sulphur, 1.96..

Seleniferous :: Seleniferous (a.) Containing, or impregnated with, selenium; as, seleniferous pyrites..

Marcasite :: Marcasite (n.) A sulphide of iron resembling pyrite or common iron pyrites in composition, but differing in form; white iron pyrites..

Persulphide :: Persulphide (n.) A sulphide containing more sulphur than some other compound of the same elements; as, iron pyrites is a persulphide; -- formerly called persulphuret..

Pyritical :: Pyritical (a.) Of or pertaining to pyrites; consisting of, or resembling, pyrites..

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