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

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.

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

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

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

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..

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

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..

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

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

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.

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

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..

Leucopyrite :: Leucopyrite (n.) A mineral of a color between white and steel-gray, with a metallic luster, and consisting chiefly of arsenic and iron..

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..

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..

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

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