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

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

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..

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..

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..

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

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

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..

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

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..

Pyritaceous :: Pyritaceous (a.) Of or pertaining to pyrites. See Pyritic.

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

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

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..

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

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

Melampyrite :: Melampyrite (n.) The saccharine substance dulcite; -- so called because found in the leaves of cowwheat (Melampyrum). See Dulcite.

Loellingite :: Loellingite (n.) A tin-white arsenide of iron, isomorphous with arsenopyrite..

Pyrites :: Pyrites (pl. ) of Pyrit.

Mundic :: Mundic (n.) Iron pyrites, or arsenical pyrites; -- so called by the Cornish miners..

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