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

Pyrites :: Pyrites (n.) A name given to a number of metallic minerals, sulphides of iron, copper, cobalt, nickel, and tin, of a white or yellowish color..

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..

Pyrite :: Pyrite (n.) A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide..

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..

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

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..

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..

Bisulphide :: Bisulphide (n.) A sulphide having two atoms of sulphur in the molecule; a disulphide, as in iron pyrites, FeS2; -- less frequently called bisulphuret..

Stanno- :: Stannite (n.) A mineral of a steel-gray or iron-black color; tin pyrites. It is a sulphide of tin, copper, and iron..

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

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..

Allomorph :: Allomorph (n.) A variety of pseudomorph which has undergone partial or complete change or substitution of material; -- thus limonite is frequently an allomorph after pyrite.

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

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

Arsenopyrite :: Arsenopyrite (n.) A mineral of a tin-white color and metallic luster, containing arsenic, sulphur, and iron; -- also called arsenical pyrites and mispickel..

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

Pyritohedron :: Pyritohedron (n.) The pentagonal dodecahedron, a common form of pyrite..

Pyritohedral :: Pyritohedral (a.) Like pyrites in hemihedral form.

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