The mineral pyrite, or iron pyrite, is iron sulfide with the formula FeS2. Glittering metallic mineral is pale-to-normal, brass yellowish hue, and often also earned the nickname as a stupid gold due to its resemblance to gold. PHYRITE name comes from the Greek (puritēs), "fire" or "in fire", from (pur), "fire". In ancient Roman times, this name was applied to several types of stone that will create a spark when struck against steel. Pyrite is usually found associated with other sulfides or oxides in quartz veins, sedimentary rock, and metamorphic rocks, and also in coal beds, and as a replacement mineral in fossils. Although dubbed the dumb gold, pyrite is sometimes also contain a small amount of gold in it. Gold and arsenic occurs as a coupled substitution in the pyrite structure. In the Carlin gold deposit, Nevada, arsenian pyrite contains up to 0.37 wt% gold.
Chemical Formula: FeS2 The Minerals is 46.6% iron by weight.
Iron disulfide, FeS2 = Sulphur 53.4, Iron 46.6%. Sometimes contain small amounts of nickel, cobalt and copper. Often carry a small amount of gold (auriferous pyrite).
Color: pale yellow brass on the surface of fresh, stain to a darker color. Streak: greenish or brownish black.
Hardness: 6.0 to 6.5 (This is extremely difficult for sulfide a)
Density: 5.02
Cleavage: imperfect cleavage and its fracture conchoidal. This mineral fragile.
Crystallography: Isometric: Cubic
Hardness: 6.0 to 6.5 (This is extremely difficult for sulfide a)
Density: 5.02
Cleavage: imperfect cleavage and its fracture conchoidal. This mineral fragile.
Crystallography: Isometric: Cubic
The number of forms that have been observed in pyrite crystals are very large. cube is the most common, with a face usually becomes striated, the striae on the face of adjacent mutually perpendicular. Among other types, octagonal, square and twelve frames.
Luster: Metallic, luster is very brilliant and radiant.
Optics: (Refractive Index): a = 1.730, b = 1.758; y = 1.838
Composition, Structure and Mineral associations Phyrite
Pyrite in some form similar to the gold which was then commonly known as fools gold. You, of course there is no difficulty in distinguishing between gold and pyrite, because pyrite containing sulfur and dissolved in nitric acid, whereas gold does not contain sulfur and acid-insoluble in all simple.
Pyrite occurs in veins and as grains or crystals are embedded in all kinds of rock. In the stone usually appears as a crystal, but in vein-masses may appear either as crystal, with other minerals, or as a structureless mass of emitting or fully occupying the gap vein. In the slates often occurs in rounded nodules and concretions of various shapes, as well as crystals. This mineral is a product of the process of freezing, metamorphic and water. Pyrite weather ready to limonite. In the body of ore near the surface was oxidized. Some of the changes to FeSO4 minerals that seeps down and helps in concentration of any precious metals that may be present in small quantities in the ore. Another part of the iron remains near the surface in the form of limonite. These include oxidized material known as "gossan" and it is characteristic of all the pyrite deposits. Pyrite is often mined for gold or copper associated with it. Due to large amounts of sulfur present in the mineral was never used as iron ore.
Pyrite is used primarily in the manufacture of sulfuric acid. This mineral is burned in the furnace and SO2 gas produced thus brought to the condenser where they are oxidized by finely divided platinum or the oxides of nitrogen. The residue, consisting mostly of FeO2, sometimes processed to iron or made into paint. These residues are sometimes also contain gold and other precious metals that may have been in the original pyrite. Sulfuric acid derived from pyrite into many manufacturing processes, and the greater part of it will be consumed in the artificial fertilizer industry.
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